Income Taxes - Components of Provision (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 5.7	$ 0.0	$ 0.0
State	8.3	6.1	1.0
Foreign	10.1	2.6	1.9
Total current income taxes	24.1	8.7	2.9
Deferred:
Federal	5.5	(198.8)	0.0
State	(3.4)	(51.4)	0.0
Foreign	(7.0)	(27.1)	0.2
Total deferred income taxes	(4.9)	(277.3)	0.2
Income taxes at effective rates	$ 19.2	$ (268.6)	$ 3.1

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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