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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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) $ (0.1)    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 0.7 $ 1.5 $ 1.5
Charged to Cost and Expense   0.2 0.1
Accounts Written off / Reductions 0.0 (1.0) (0.1)
Balance at End of Year 0.6 0.7 1.5
Deferred Tax Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 99.7 161.3 127.4
Additions 31.5 0.0 33.9
Accounts Written off / Reductions 0.0 (61.6) 0.0
Balance at End of Year $ 131.2 $ 99.7 $ 161.3