Income Taxes - Reconciliation of the 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 January 1	$ 17.2	$ 10.1	$ 8.9
Additions based on tax positions related to current year	1.3	8.7	0.0
Additions for tax positions of prior years	2.6	0.0	1.9
Reductions for tax positions of prior years	(0.5)	(0.1)	0.0
Reductions due to lapse of statute of limitations	0.0	(0.6)	(0.7)
Reductions due to settlements	0.0	(0.9)	0.0
Balance at December 31	$ 20.6	$ 17.2	$ 10.1