Income Taxes - Income Tax Provision (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
U.S. federal	$ (0.5)	$ (23.9)	$ (21.5)
Non-U.S.	30.8	2.4	28.4
State	0.0	1.7	(0.3)
Total current	30.3	(19.8)	6.6
Deferred:
U.S. federal	0.0	23.4	20.3
Non-U.S.	(7.5)	4.4	19.3
State	0.0	0.0	(0.2)
Total deferred	(7.5)	27.8	39.4
Total income tax provision	$ 22.8	$ 8.0	$ 46.0