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