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Employee Benefits - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) trust shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total cost for retirement plans | $ 124.0 | $ 93.0 | $ 91.0
Defined contribution plan cost | 88.0 | 86.0 | 80.0
Pension trust assets | $ 1,464.0 | 2,231.0 |
U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of pension trust accounts | trust | 1 |  |
Pension trust assets | $ 1,185.0 | $ 1,600.0 |
Stock purchased by US plan under defined contribution plan (shares) | shares | 67,248 | 107,651 |
Stock sold by US plan under defined contribution plan (shares) | shares | 60,473 | 160,415 |
Stock held by the US plan under defined contribution plan (shares) | shares | 1,200,000 | 1,200,000 |
Market value of stock held by the US plan under defined contribution plan | $ 402.0 | $ 567.0 |
S&P Global Inc. dividends received | $ 4.0 | 3.8 |
U.S. | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 90.00% |  |
U.S. | Domestic equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 5.00% |  |
U.S. | International equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 3.00% |  |
U.S. | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 2.00% |  |
U.K. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of pension trust accounts | trust | 1 |  |
Pension trust assets | $ 279.0 | 631.0 |
U.K. | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 39.00% |  |
U.K. | Diversified growth funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 5.00% |  |
U.K. | Infrastructure |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 29.00% |  |
U.K. | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 14.00% |  |
U.K. | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 13.00% |  |
Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other components of net periodic benefit cost | $ (8.0) | (36.0) | (26.0)
Expected required employer contribution | $ 10.0 |  |
Number of pension trust accounts | trust | 2 |  |
Pension trust assets | $ 1,464.0 | 2,231.0 | 2,243.0
Retirement Plans | U.K. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other components of net periodic benefit cost | (6.0) | (22.0) | (17.0)
Postretirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other components of net periodic benefit cost | (3.0) | (2.0) | (2.0)
Expected required employer contribution | 3.0 |  |
Pension trust assets | $ 5.0 | $ 6.0 | $ 9.0

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