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Supplemental Guarantor Information Supplemental Guarantor Information (Textuals) (Details) - USD ($)
$ in Millions
Apr. 19, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Senior Notes, Noncurrent   $ 225.0 $ 225.0
Subsequent Event [Member] | 2016 Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes, Noncurrent $ 400.0    
Debt Instrument, Interest Rate, Stated Percentage 8.50%