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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Document Fiscal Year Focus 2021    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation allowance $ 39.1 $ 98.0 $ 85.3
Allowance for doubtful accounts receivable 0.2 1.6 0.8
Allowance for Doubtful Accounts      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease) (0.2)    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 1.6 0.8 0.6
Charged to Cost and Expense   0.8 0.3
Accounts Written off / Reductions (1.2) 0.0 (0.1)
Balance at End of Year   1.6 0.8
Deferred Tax Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 98.0 85.3 131.2
Additions 0.0 12.7 0.0
Accounts Written off / Reductions $ (58.9) 0.0 (45.9)
Balance at End of Year   $ 98.0 $ 85.3