Subsequent Events (Details) - USD ($) | | | | 3 Months Ended | | |
May 01, 2024 | Apr. 16, 2024 | Apr. 01, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Mar. 31, 2023 | Apr. 11, 2024 | Dec. 31, 2023 |
Cash-settled Stock Appreciation Rights | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Remaining outstanding shares (in shares) | | | | | 3,452,120 | | | 3,452,120 |
Pre-tax compensation expense | | | | | $ (1,000,000) | $ 10,000,000 | | |
Subsequent Event | Forecast | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Reduction of deferred income tax assets | | | | $ 5,000,000 | | | | |
Increase in income taxes from changes to previously deductible expenses | | | | 5,000,000 | | | | |
Subsequent Event | UL Standards & Engagement Liabrary Access | UL Solutions | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Ownership percentage | | 80.60% | | | | | | |
Voting power | | 97.60% | | | | | | |
Subsequent Event | Payments Testing Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Proceeds from sale | $ 30,000,000 | | | | | | | |
Subsequent Event | Payments Testing Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Forecast | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Gain on sale of business | | | | 25,000,000 | | | | |
Subsequent Event | Cash-settled Stock Appreciation Rights | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Remaining outstanding shares (in shares) | | 118,904 | | | | | | |
Subsequent Event | 2024 Long-Term Incentive Plan | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Aggregate value of granted equity awards | | $ 17,000,000 | | | | | | |
Nonqualified stock options granted (in shares) | | 2,074,299 | | | | | | |
Subsequent Event | 2024 Long-Term Incentive Plan | Revision of Prior Period, Adjustment | Forecast | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Pre-tax compensation expense | | | | 9,000,000 | | | | |
Subsequent Event | 2024 Long-Term Incentive Plan | Stock Appreciation Rights (SARs) | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Decrease in shares upon conversion (in shares) | | (1,978,761) | | | | | | |
Increase in shares upon conversion (in shares) | | 1,978,761 | | | | | | |
Subsequent Event | 2024 Long-Term Incentive Plan | Cash-settled Stock Appreciation Rights | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Expired CSARs (in shares) | | | 1,334,640 | | | | | |
Decrease in shares upon conversion (in shares) | | 1,978,761 | | | | | | |
Increase in shares upon conversion (in shares) | | (1,978,761) | | | | | | |
Decrease in accrued compensation upon conversion | | $ 25,000,000 | | | | | | |
Increase in accrued compensation upon conversion | | (25,000,000) | | | | | | |
Subsequent Event | 2024 Long-Term Incentive Plan | Cash-settled Stock Appreciation Rights | Forecast | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Cash paid during the period for stock-based compensation | | | | $ 18,000,000 | | | | |
Subsequent Event | 2024 Long-Term Incentive Plan | Stock Appreciation Rights Reclassified | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Decrease in accrued compensation upon conversion | | (25,000,000) | | | | | | |
Increase in accrued compensation upon conversion | | $ 25,000,000 | | | | | | |
Subsequent Event | 2024 Long-Term Incentive Plan | Employee Stock Option | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Expiration period | | 10 years | | | | | | |
Vesting period | | 3 years | | | | | | |
Subsequent Event | 2024 Long-Term Incentive Plan | Restricted Stock Units (RSUs) | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Stock units granted (in shares) | 711,256 | 22,486 | | | | | | |
Vesting period | | 3 years | | | | | | |
Aggregate value | $ 25,000,000 | | | | | | | |
Subsequent Event | 2024 Long-Term Incentive Plan | Performance Shares | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Stock units granted (in shares) | 382,455 | | | | | | | |
Vesting period | | 3 years | | | | | | |
Aggregate value | $ 13,000,000 | | | | | | | |
Common Class A | Subsequent Event | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Common stock authorized (in shares) | | | | | | | 1,000,000,000 | |
Common Class A | Subsequent Event | 2024 Long-Term Incentive Plan | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Stock reserved for issuance (in shares) | | 20,000,000 | | | | | | |
Common Class A | Subsequent Event | IPO | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Shares sold in IPO (in shares) | | 38,870,000 | | | | | | |
Price per share for IPO (in dollars per share) | | $ 28 | | | | | | |
Proceeds from IPO | | $ 0 | | | | | | |
Common Class A | Subsequent Event | Over-Allotment Option | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Shares sold in IPO (in shares) | | 5,070,000 | | | | | | |
Common Class B | Subsequent Event | | | | | | | | |
Subsequent Event [Line Items] | | | | | | | | |
Common stock authorized (in shares) | | | | | | | 500,000,000 | |