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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for Doubtful Accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 0.8 $ 1.7 $ 1.8
Charged to Cost and Expense 1.1 (0.8) 0.3
Accounts Written off / Reductions (0.1) (0.1) (0.4)
Balance at End of Year 1.8 0.8 1.7
Deferred Tax Valuation Allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 80.7 71.5 74.1
Additions 108.1 80.7 0.0
Accounts Written off / Reductions 0.0 (71.5) (2.6)
Balance at End of Year $ 188.8 $ 80.7 $ 71.5