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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Interest expense on income taxes $ 0.0 $ 0.0 $ 0.0
Potential penalty expense 0.0 0.0 0.0
Total accrued liabilities 0.3 0.3 0.3
Potential benefit on the effective tax rate 2.0    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits beginning balance 10.2 12.7 10.1
Settlements     (0.1)
Additions for tax positions of prior years     2.8
Reductions for tax positions of prior years (0.3)    
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities (0.4) (2.6)  
Unrecognized tax benefits ending balance $ 9.5 $ 10.2 12.7
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions     $ 0.1