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Schedule of Changes in Unrecognized Income Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Uncertainties [Abstract]        
Unrecognized tax benefits classified within deferred taxes as a reduction of net operating loss carryforwards $ 12.3 $ 13.0 $ 11.5  
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward        
Increases in prior period tax positions 0.0 0.0 0.0  
Decreases in prior period tax positions 0.0 0.0 0.0  
Increases in current period tax positions 0.3 2.7 0.9  
Unrecognized tax benefits 14.2 15.2 14.4 $ 14.7
Expiration of the statute of limitations (1.3) (1.9) (1.2)  
Settlements 0.0 0.0 0.0  
Ending balance 14.2 15.2 $ 14.4  
Income tax penalties and interest accrued 1.9 $ 2.3    
Unrecognized tax benefits that would impact effective tax rate 2.0      
Unrecognized tax benefits that will be recognized within 12 months of year end $ 2.0