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Debt Schedule of Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Deferred issuance costs   $ 0.1
Long-term debt, current $ 39.1 6.1
Long-term debt 120.2 157.5
Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term debt, face amount 74.3 74.3
Long-term debt, interest 45.9 52.0
Long-term debt, current 6.1 6.1
Long-term debt 120.2 126.3
Payment in Kind (PIK) Note [Member]    
Debt Instrument [Line Items]    
Long-term debt, carrying amount   31.3
Long-term debt, current $ 33.0  
Long-term debt   $ 31.2