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Schedule II - Valuation and Qualifying Accounts - Rollforward of Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Uncollectible Accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 1.5 $ 0.2 $ 0.2
Charged to Costs and Expenses 0.7 1.3 0.0
Deductions (0.1) 0.0 0.0
Balance at End of Period 2.1 1.5 0.2
Allowance for Surplus and Obsolete Inventory      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 8.4 2.9 1.9
Charged to Costs and Expenses 1.5 7.2 1.6
Deductions (1.8) (1.7) (0.6)
Balance at End of Period 8.1 8.4 2.9
Valuation Allowance on Deferred Tax Assets      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 10.2 11.7 14.1
Charged to Costs and Expenses 15.6 0.0 0.0
Charged to Other Accounts 0.0 0.0 0.0
Deductions (1.4) (1.5) (2.4)
Balance at End of Period $ 24.4 $ 10.2 $ 11.7