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Employee Benefits - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) trust shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total cost for retirement plans | $ 159.0 | $ 170.0 | $ 124.0
Defined contribution plan cost | 126.0 | 120.0 | 88.0
Pension trust assets | $ 1,395.0 | 1,473.0 |
U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of pension trust accounts | trust | 1 |  |
Pension trust assets | $ 1,130.0 | $ 1,176.0 |
Stock purchased by US plan under defined contribution plan (in shares) | shares | 81,400 | 146,600 |
Stock sold by US plan under defined contribution plan (in shares) | shares | 159,810 | 179,569 |
Stock held by the US plan under defined contribution plan (in shares) | shares | 1,100,000 | 1,200,000 |
Market value of stock held by the US plan under defined contribution plan | $ 547.0 | $ 518.0 |
S&P Global Inc. dividends received | $ 4.4 | 4.5 |
U.S. | Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations (as a percent) | 90.00% |  |
U.S. | Domestic Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations (as a percent) | 5.00% |  |
U.S. | International Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations (as a percent) | 3.00% |  |
U.S. | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations (as a percent) | 2.00% |  |
U.K. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of pension trust accounts | trust | 1 |  |
Pension trust assets | $ 265.0 | 297.0 |
U.K. | Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations (as a percent) | 95.00% |  |
U.K. | Diversified Growth Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations (as a percent) | 5.00% |  |
Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit cost (benefit) | $ (18.0) | 4.0 | (8.0)
Expected required employer contribution | $ 11.0 |  |
Number of pension trust accounts | trust | 2 |  |
Pension trust assets | $ 1,395.0 | 1,473.0 | 1,464.0
Retirement Plans | U.K. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit cost (benefit) | 3.0 | 4.0 | (6.0)
Postretirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit cost (benefit) | (3.0) | (3.0) | (3.0)
Expected required employer contribution | 2.0 |  |
Pension trust assets | $ 1.0 | $ 1.0 | $ 5.0

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