Retirement Benefits - Obligations and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended |
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Noncurrent asset | $ 17.7 | $ 18.4 | |
Total | | | |
Changes in the benefit obligation [Roll Forward] | | | |
Benefit obligation at beginning of year | 1,331.7 | 1,427.8 | |
Service cost | 8.1 | 9.1 | $ 9.7 |
Interest cost | 36 | 33.2 | 38.3 |
Participant contributions | 0.3 | 0.4 | |
Plan amendments | 0.1 | (0.7) | |
Plan combinations | 0.9 | 7.6 | |
Acquisitions | 0 | 5.9 | |
Curtailment | (0.4) | (1.1) | |
Settlements | (10.8) | (14) | |
Benefits paid | (61.1) | (60.7) | |
Actuarial gains | (317.5) | (59.6) | |
Foreign currency exchange effects | (25.4) | (16.2) | |
Benefit obligation at end of year | 961.9 | 1,331.7 | 1,427.8 |
Changes in plan assets [Roll Forward] | | | |
Fair value of plan assets at beginning of year | 1,125.1 | 1,102.9 | |
Return on assets – actual | (205.2) | 86.7 | |
Participant contributions | 0.3 | 0.4 | |
Plan combinations | 0.9 | 5 | |
Employer contributions | 15.3 | 13.2 | |
Settlements | (10.8) | (14) | |
Benefits paid | (61.1) | (60.7) | |
Foreign currency exchange effects | (22.7) | (8.4) | |
Fair value of plan assets at end of year | 841.8 | 1,125.1 | 1,102.9 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Funded status | (120.1) | (206.6) | |
Noncurrent asset | 17.7 | 18.4 | |
Current liability, included in accrued liabilities | 6.8 | 5.7 | |
Noncurrent liability | 131 | 219.3 | |
Net pension liability | 120.1 | 206.6 | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net gains and losses | (289.6) | (403.9) | |
Net actuarial gains arising during the year | 50.9 | 69.7 | |
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss) | 29.4 | 43.9 | |
Foreign currency exchange effects | 3.7 | 0.7 | |
End of year - net gains and losses | (205.6) | (289.6) | (403.9) |
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net prior service (cost) credit | 0.1 | (0.6) | |
Prior service credit (cost) from plan amendments during the year | (0.1) | 0.7 | |
Foreign currency exchange effects | (0.1) | 0 | |
End of year - net prior service (cost) credit | (0.1) | 0.1 | (0.6) |
Retirement benefits other than pension | | | |
Changes in the benefit obligation [Roll Forward] | | | |
Benefit obligation at beginning of year | 510.4 | 558 | |
Service cost | 0.1 | 0.1 | 0.1 |
Interest cost | 14 | 13 | 16.5 |
Plan amendments | (66.7) | 0 | |
Benefits paid | (29.3) | (31) | |
Actuarial gains | (105.7) | (29) | |
Foreign currency exchange effects | 0.3 | (0.7) | |
Benefit obligation at end of year | 323.1 | 510.4 | 558 |
Changes in plan assets [Roll Forward] | | | |
Fair value of plan assets at beginning of year | 178 | 168 | |
Return on assets – actual | (15.1) | 32.9 | |
Plan combinations | (3.6) | 0 | |
Employer contributions | 9 | 8.1 | |
Benefits paid | (29.3) | (31) | |
Fair value of plan assets at end of year | 139 | 178 | 168 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Funded status | (184.1) | (332.4) | |
Current liability, included in accrued liabilities | 9.6 | 10.2 | |
Noncurrent liability | 174.5 | 322.2 | |
Net pension liability | 184.1 | 332.4 | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net gains and losses | (234) | (310.4) | |
Net actuarial gains arising during the year | 77.4 | 49.6 | |
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss) | 17.3 | 26.5 | |
Foreign currency exchange effects | (0.1) | 0.3 | |
End of year - net gains and losses | (139.4) | (234) | (310.4) |
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net prior service (cost) credit | 19.2 | 24.2 | |
Prior service credit (cost) from plan amendments during the year | 66.7 | 0 | |
Reclassification adjustment for amortization of prior service cost included in net income (loss) | (4.9) | (5) | |
Foreign currency exchange effects | 0 | 0 | |
End of year - net prior service (cost) credit | 81 | 19.2 | 24.2 |
U.S. Plans | | | |
Changes in the benefit obligation [Roll Forward] | | | |
Benefit obligation at beginning of year | 839.5 | 908 | |
Service cost | 0 | 0 | 0 |
Interest cost | 22.9 | 21.1 | 26.7 |
Participant contributions | 0 | 0 | |
Plan amendments | 0 | 0 | |
Plan combinations | 0 | 0 | |
Settlements | 0 | 0 | |
Benefits paid | (45) | (46.9) | |
Actuarial gains | (190.2) | (42.7) | |
Foreign currency exchange effects | 0 | 0 | |
Benefit obligation at end of year | 627.2 | 839.5 | 908 |
Changes in plan assets [Roll Forward] | | | |
Fair value of plan assets at beginning of year | 764.8 | 747.1 | |
Return on assets – actual | (124.1) | 63.9 | |
Participant contributions | 0 | 0 | |
Plan combinations | 0 | 0 | |
Employer contributions | 0.6 | 0.7 | |
Settlements | 0 | 0 | |
Benefits paid | (45) | (46.9) | |
Foreign currency exchange effects | 0 | 0 | |
Fair value of plan assets at end of year | 596.3 | 764.8 | 747.1 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Funded status | (30.9) | (74.7) | |
Current liability, included in accrued liabilities | 0.7 | 0.6 | |
Noncurrent liability | 30.2 | 74.1 | |
Net pension liability | 30.9 | 74.7 | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net gains and losses | (228.3) | (321.5) | |
Net actuarial gains arising during the year | 17.4 | 59.2 | |
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss) | 24.2 | 34 | |
Foreign currency exchange effects | 0 | 0 | |
End of year - net gains and losses | (186.7) | (228.3) | (321.5) |
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net prior service (cost) credit | 0 | 0 | |
Prior service credit (cost) from plan amendments during the year | 0 | 0 | |
Foreign currency exchange effects | 0 | 0 | |
End of year - net prior service (cost) credit | 0 | 0 | 0 |
U.S. Plans | Actuarial Gains (Losses) - Change in Discount Rate | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains arising during the year | 193 | 41 | |
U.S. Plans | Actuarial Gains (Losses) - Asset Return Different from Expected | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains arising during the year | (173) | 17 | |
Non-U.S. Plans | | | |
Changes in the benefit obligation [Roll Forward] | | | |
Benefit obligation at beginning of year | 492.2 | 519.8 | |
Service cost | 8.1 | 9.1 | 9.7 |
Interest cost | 13.1 | 12.1 | 11.6 |
Participant contributions | 0.3 | 0.4 | |
Plan amendments | 0.1 | (0.7) | |
Plan combinations | 0.9 | 7.6 | |
Acquisitions | 0 | 5.9 | |
Curtailment | (0.4) | (1.1) | |
Settlements | (10.8) | (14) | |
Benefits paid | (16.1) | (13.8) | |
Actuarial gains | (127.3) | (16.9) | |
Foreign currency exchange effects | (25.4) | (16.2) | |
Benefit obligation at end of year | 334.7 | 492.2 | 519.8 |
Changes in plan assets [Roll Forward] | | | |
Fair value of plan assets at beginning of year | 360.3 | 355.8 | |
Return on assets – actual | (81.1) | 22.8 | |
Participant contributions | 0.3 | 0.4 | |
Plan combinations | 0.9 | 5 | |
Employer contributions | 14.7 | 12.5 | |
Settlements | (10.8) | (14) | |
Benefits paid | (16.1) | (13.8) | |
Foreign currency exchange effects | (22.7) | (8.4) | |
Fair value of plan assets at end of year | 245.5 | 360.3 | 355.8 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Funded status | (89.2) | (131.9) | |
Noncurrent asset | 17.7 | 18.4 | |
Current liability, included in accrued liabilities | 6.1 | 5.1 | |
Noncurrent liability | 100.8 | 145.2 | |
Net pension liability | 89.2 | 131.9 | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net gains and losses | (61.3) | (82.4) | |
Net actuarial gains arising during the year | 33.5 | 10.5 | |
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss) | 5.2 | 9.9 | |
Foreign currency exchange effects | 3.7 | 0.7 | |
End of year - net gains and losses | (18.9) | (61.3) | (82.4) |
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net prior service (cost) credit | 0.1 | (0.6) | |
Prior service credit (cost) from plan amendments during the year | (0.1) | 0.7 | |
Foreign currency exchange effects | (0.1) | 0 | |
End of year - net prior service (cost) credit | (0.1) | 0.1 | (0.6) |
Non-U.S. Plans | Actuarial Gains (Losses) - Change in Discount Rate | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains arising during the year | 133 | | |
Non-U.S. Plans | Actuarial Gains (Losses) - Asset Return Different from Expected | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains arising during the year | (94) | 10 | |
UMWA Plans | | | |
Changes in the benefit obligation [Roll Forward] | | | |
Benefit obligation at beginning of year | 397.4 | 440.1 | |
Service cost | 0 | 0 | 0 |
Interest cost | 10.3 | 9.8 | 12.7 |
Plan amendments | (66.7) | 0 | |
Benefits paid | (20.3) | (22.9) | |
Actuarial gains | (86.8) | (29.6) | |
Foreign currency exchange effects | 0 | 0 | |
Benefit obligation at end of year | 233.9 | 397.4 | 440.1 |
Changes in plan assets [Roll Forward] | | | |
Fair value of plan assets at beginning of year | 178 | 168 | |
Return on assets – actual | (15.1) | 32.9 | |
Plan combinations | (3.6) | 0 | |
Benefits paid | (20.3) | (22.9) | |
Fair value of plan assets at end of year | 139 | 178 | 168 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Funded status | (94.9) | (219.4) | |
Current liability, included in accrued liabilities | 0 | 0 | |
Noncurrent liability | 94.9 | 219.4 | |
Net pension liability | 94.9 | 219.4 | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net gains and losses | (162.4) | (230.1) | |
Net actuarial gains arising during the year | 58.5 | 50.2 | |
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss) | 10 | 17.5 | |
Foreign currency exchange effects | 0 | 0 | |
End of year - net gains and losses | (93.9) | (162.4) | (230.1) |
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net prior service (cost) credit | 18.6 | 23.3 | |
Prior service credit (cost) from plan amendments during the year | 66.7 | 0 | |
Reclassification adjustment for amortization of prior service cost included in net income (loss) | (4.6) | (4.7) | |
Foreign currency exchange effects | 0 | 0 | |
End of year - net prior service (cost) credit | 80.7 | 18.6 | 23.3 |
UMWA Plans | Actuarial Gains (Losses) - Change in Discount Rate | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains arising during the year | 78 | 23 | |
UMWA Plans | Actuarial Gains (Losses) - Change in Census Data | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains arising during the year | (12) | | |
UMWA Plans | Actuarial Gains (Losses) - Asset Return Different from Expected | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains arising during the year | (28) | 21 | |
UMWA Plans | Actuarial Gains (Losses) - Change in Claims Experience | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains arising during the year | 12 | 9 | |
Black Lung and Other Plans | | | |
Changes in the benefit obligation [Roll Forward] | | | |
Benefit obligation at beginning of year | 113 | 117.9 | |
Service cost | 0.1 | 0.1 | 0.1 |
Interest cost | 3.7 | 3.2 | 3.8 |
Plan amendments | 0 | 0 | |
Benefits paid | (9) | (8.1) | |
Actuarial gains | (18.9) | 0.6 | |
Foreign currency exchange effects | 0.3 | (0.7) | |
Benefit obligation at end of year | 89.2 | 113 | 117.9 |
Changes in plan assets [Roll Forward] | | | |
Fair value of plan assets at beginning of year | 0 | 0 | |
Return on assets – actual | 0 | 0 | |
Employer contributions | 9 | 8.1 | |
Benefits paid | (9) | (8.1) | |
Fair value of plan assets at end of year | 0 | 0 | 0 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Funded status | (89.2) | (113) | |
Current liability, included in accrued liabilities | 9.6 | 10.2 | |
Noncurrent liability | 79.6 | 102.8 | |
Net pension liability | 89.2 | 113 | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net gains and losses | (71.6) | (80.3) | |
Net actuarial gains arising during the year | 18.9 | (0.6) | |
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss) | 7.3 | 9 | |
Foreign currency exchange effects | (0.1) | 0.3 | |
End of year - net gains and losses | (45.5) | (71.6) | (80.3) |
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net prior service (cost) credit | 0.6 | 0.9 | |
Prior service credit (cost) from plan amendments during the year | 0 | 0 | |
Reclassification adjustment for amortization of prior service cost included in net income (loss) | (0.3) | (0.3) | |
Foreign currency exchange effects | 0 | 0 | |
End of year - net prior service (cost) credit | 0.3 | 0.6 | $ 0.9 |
Black Lung and Other Plans | Actuarial Gains (Losses) - Change in Discount Rate | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains arising during the year | $ 18 | 4 | |
Black Lung and Other Plans | Actuarial Gains (Losses) - Change in Census Data | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains arising during the year | | (10) | |
Black Lung and Other Plans | Actuarial Gains (Losses) - Change in Claims Experience | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains arising during the year | | $ 4 | |