Income Taxes - Income Tax (Benefit) Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current income tax (expense) benefit:
U.S. federal	$ (3.8)	$ (10.4)	$ 0.9
State	(2.1)	(4.2)	(3.7)
Non-U.S.	(3.9)	(1.1)	(1.7)
Total current income tax (expense) benefit	(9.8)	(15.7)	(4.5)
Deferred income tax (expense) benefit:
U.S. federal	(4.9)	23.2	(14.9)
State	(5.6)	10.3	(10.4)
Non-U.S.	(18.3)	2.7	0.5
Total deferred income tax (expense) benefit	(28.8)	36.2	(24.8)
Total income tax (expense) benefit	$ (38.6)	$ 20.5	$ (29.3)