Income Taxes (Provision for Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Current:
Federal					$ 109.0	$ 159.2	$ 132.1
State					34.9	33.7	26.6
Foreign					27.0	20.0	14.5
Total current					170.9	212.9	173.2
Deferred:
Federal					23.2	(19.6)	(22.2)
State					(3.5)	(4.0)	(4.9)
Foreign					0.4	(1.0)	1.6
Total deferred					20.1	(24.6)	(25.5)
Total provision for income taxes	$ 36.2	$ 57.5	$ 66.1	$ 31.2	$ 191.0	$ 188.3	$ 147.7