Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward]
Beginning Balance	$ 60.7	$ 40.7	$ 25.3
Additions for Tax Positions Taken in the Current Year	2.0	2.1	1.7
Additions for Tax Positions Taken in Prior Years	10.8	24.0	13.7
Reductions for Tax Positions Taken in Prior Years	(10.9)	(5.1)	0.0
Reductions Resulting from Settlements with Taxing Authorities	(2.5)	0.0	0.0
Reductions Resulting from Expiration of Statutes	(1.6)	(1.0)	0.0
Ending Balance	$ 58.5	$ 60.7	$ 40.7