Income Taxes - Summary of Activities Related to 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	$ 1.2	$ 1.3	$ 1.6
Increases related to current year tax	0.1	0.0	0.0
Increases from prior period positions	0.0	0.0	0.2
Decreases from settlements with tax authorities	0.0	0.0	(0.2)
Decreases due to lapse of statute of limitations	(0.1)	(0.1)	(0.3)
Balance at December 31	$ 1.2	$ 1.2	$ 1.3