Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Currently payable
Federal	$ 0.0	$ 0.8	$ 0.0
International	113.3	104.9	87.6
Total current taxes	113.3	105.7	87.6
Deferred
Federal	0.1	0.1	2.0
International	8.1	82.6	(174.0)
Total deferred taxes	8.2	82.7	(172.0)
Total provision (benefit) for income taxes	$ (121.5)	$ (188.4)	$ 84.4