FAIR VALUE MEASUREMENTS (Measured on Recurring Basis) (Details) - USD ($) $ in Millions | 9 Months Ended | |
Sep. 30, 2024 | Dec. 31, 2023 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, effect of counter-party netting | $ (11.5) | $ (23.7) |
Earn-out payment | 18.8 | |
Fair Value, Measurements, Recurring | Level 1 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Non-qualified pension plan assets | 20.3 | 18.8 |
Fair Value, Measurements, Recurring | Commodity contracts | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, gross carrying value | 67.4 | 46.9 |
Derivative liability, effect of counter-party netting | (64.2) | (46.9) |
Derivative Liability | 3.2 | 0 |
Fair Value, Measurements, Recurring | Commodity contracts | Level 1 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, gross carrying value | 65.3 | 46.9 |
Fair Value, Measurements, Recurring | Commodity contracts | Level 2 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, gross carrying value | 2.1 | 0 |
Fair Value, Measurements, Recurring | Commodity contracts | Level 3 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, gross carrying value | 0 | 0 |
Fair Value, Measurements, Recurring | Renewable energy credit and emissions obligations | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Obligations, Fair Value Disclosure | 473.7 | 429.8 |
Derivative liability, effect of counter-party netting | 0 | 0 |
Fair Value, Measurements, Recurring | Renewable energy credit and emissions obligations | Level 1 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Obligations, Fair Value Disclosure | 0 | 0 |
Fair Value, Measurements, Recurring | Renewable energy credit and emissions obligations | Level 2 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Obligations, Fair Value Disclosure | 473.7 | 429.8 |
Fair Value, Measurements, Recurring | Renewable energy credit and emissions obligations | Level 3 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Obligations, Fair Value Disclosure | 0 | 0 |
Fair Value, Measurements, Recurring | Contingent consideration obligation | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Obligations, Fair Value Disclosure | | 21.6 |
Derivative liability, effect of counter-party netting | | 0 |
Fair Value, Measurements, Recurring | Contingent consideration obligation | Level 1 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Obligations, Fair Value Disclosure | | 0 |
Fair Value, Measurements, Recurring | Contingent consideration obligation | Level 2 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Obligations, Fair Value Disclosure | | 0 |
Fair Value, Measurements, Recurring | Contingent consideration obligation | Level 3 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Obligations, Fair Value Disclosure | | 21.6 |
Fair Value, Measurements, Recurring | Money market funds | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents | 45.6 | 141.6 |
Fair Value, Measurements, Recurring | Money market funds | Level 1 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents | 45.6 | 141.6 |
Fair Value, Measurements, Recurring | Money market funds | Level 2 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents | 0 | 0 |
Fair Value, Measurements, Recurring | Money market funds | Level 3 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents | 0 | 0 |
Fair Value, Measurements, Recurring | Commodity contracts | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, gross carrying value | 64.2 | 80.1 |
Derivative assets, effect of counter-party netting | (64.2) | (46.9) |
Derivative assets, net carrying value | 0 | 33.2 |
Fair Value, Measurements, Recurring | Commodity contracts | Level 1 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, gross carrying value | 61.6 | 80.1 |
Fair Value, Measurements, Recurring | Commodity contracts | Level 2 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, gross carrying value | 2.6 | 0 |
Fair Value, Measurements, Recurring | Commodity contracts | Level 3 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, gross carrying value | $ 0 | $ 0 |