Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Unrecognized Tax Benefits [Roll Forward]
Beginning Balance	$ 58.5	$ 60.7	$ 40.7
Additions for Tax Positions Taken in the Current Year	2.5	2.0	2.1
Additions for Tax Positions Taken in Prior Years	7.1	10.8	24.0
Reductions for Tax Positions Taken in Prior Years	(6.0)	(10.9)	(5.1)
Reductions Resulting from Settlements with Taxing Authorities	(4.7)	(2.5)	0.0
Reductions Resulting from Expiration of Statutes	0.0	(1.6)	(1.0)
Ending Balance	$ 57.4	$ 58.5	$ 60.7