Income Taxes - Provision (Benefit) for Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current (benefit) provision:
Federal	$ (0.2)	$ (14.0)	$ (0.5)
State	(0.6)	2.4	0.8
Foreign	0.7	1.8	1.0
Total current (benefit) provision	(0.1)	(9.8)	1.3
Deferred (benefit) provision:
Federal	(0.1)	12.3	2.8
State	1.1	(1.4)	(1.0)
Foreign	(2.3)	(2.3)	(0.1)
Total deferred (benefit) provision	(1.3)	8.6	1.7
Total (benefit) provision:
Federal	(0.3)	(1.7)	2.3
State	0.5	1.0	(0.3)
Foreign	(1.6)	(0.5)	0.9
Total income tax (benefit) provision	$ (1.4)	$ (1.2)	$ 3.0