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Stock-Based Compensation - Share-Based Compensation Expense by Line Item (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ (15.2) $ (6.5) $ (10.1)
Income tax benefit (3.6) (1.6) (2.4)
Net loss (11.6) (4.9) (7.7)
SG&A Expenses      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ (15.2) $ (6.5) $ (10.1)