Stock-Based Compensation - Components of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Equity classified awards expense	$ 4.4	$ 3.1
Liability classified awards expense	0.4	1.5
Total pre-tax stock-based compensation expense	4.8	4.6
Book income tax benefit	(1.2)	(1.1)
Total stock-based compensation expense, net of tax	$ 3.6	$ 3.5