Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory U.S. federal tax	$ 249.1	$ 193.9	$ 229.2
State and local income tax, net of federal benefit (national income tax effect	26.0	19.2	14.1
Affiliate equity expense	19.2	1.4	0.8
Effect of cross-border tax laws	9.1	6.5	(4.4)
Nontaxable or nondeductible items	5.2	4.2	5.1
Change in valuation allowance	0.2	0.3	0.6
Unrecognized tax benefits	10.5	1.2	5.1
Effect of income from non-controlling interests	(31.4)	(42.0)	(43.4)
Income tax expense	$ 282.3	$ 182.6	$ 185.3
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory U.S. federal tax	21.00%	21.00%	21.00%
State and local income tax, net of federal benefit (national) income tax effect	2.10%	2.10%	1.30%
Affiliate equity expense	1.70%	0.20%	0.10%
Effect of cross-border tax laws	0.80%	0.70%	(0.40%)
Nontaxable or nondeductible items	0.40%	0.50%	0.50%
Change in valuation allowance	0.00%	0.00%	0.10%
Unrecognized tax benefits	0.90%	0.10%	0.50%
Effect of income from non-controlling interests	(2.60%)	(4.50%)	(4.00%)
Effective tax	23.80%	19.90%	17.00%
United Kingdom
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Other	$ 1.8	$ 7.0	$ 3.5
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Other	0.10%	0.80%	0.30%
Other foreign jurisdictions
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Foreign income tax rate differential	$ (7.4)	$ (9.1)	$ (25.3)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Foreign income tax rate differential	(0.60%)	(1.00%)	(2.40%)