Income Taxes - Income Tax (Benefit) Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current income tax (expense) benefit:
U.S. federal	$ (6.3)	$ (12.6)	$ (16.9)
State	(0.4)	(2.2)	(4.5)
Non-U.S.	(14.8)	(16.6)	(7.1)
Total current income tax (expense) benefit	(21.5)	(31.4)	(28.5)
Deferred income tax (expense) benefit:
U.S. federal	(18.8)	(13.2)	(7.3)
State	2.7	(3.8)	(1.8)
Non-U.S.	5.0	63.9	(3.8)
Total deferred income tax (expense) benefit	(11.1)	46.9	(12.9)
Total income tax (expense) benefit	$ (32.6)	$ 15.5	$ (41.4)