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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, carrying amount $ 166.3 $ 234.6
Senior Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, carrying amount 135.8  
Long-term debt, fair value 59.7  
Long-term debt, face amount 74.3  
Payment in Kind (PIK) Note [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, carrying amount 30.5 234.6
Long-term debt, fair value $ 18.7 $ 107.4