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Debt - 2023 Senior Notes (Details) - 2023 Senior Notes
$ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
Aug. 17, 2015
USD ($)
Debt    
Interest rate (as a percent) 7.875%  
Redemption price as a percentage of principal 107.875%  
Repurchase price as a percentage of principal amount of notes plus accrued and unpaid interest 100.00%  
Carrying value, net $ 489.0  
Maximum    
Debt    
Percentage of principal amount of debt that may be redeemed utilizing net cash proceeds from certain equity offerings, and provided that a certain percentage of the originally issued debt remains outstanding after such redemption 35.00%  
Minimum    
Debt    
Percentage of principal amount of debt that must remain outstanding for certain redemption terms to be applicable 65.00%  
Percentage of aggregate principal that must be held to accelerate amounts due 25  
Change Of Control    
Debt    
Repurchase price as a percentage of principal amount of notes plus accrued and unpaid interest 101.00%  
CBR Acquisition Holdings Corp | Private Placement    
Debt    
Aggregate principal amount of debt issued   $ 500.0