Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 9.1	$ 16.5	$ 14.0
Additions for current year tax positions	3.0	1.9	2.2
(Reductions) additions for prior year tax positions	(1.1)	(9.3)	0.3
Balance at end of period	$ 11.0	$ 9.1	$ 16.5