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Debt - 6.625% Senior Notes (Details) - USD ($)
$ in Millions
May 18, 2017
Jun. 30, 2014
Senior Notes | 6.625% Senior Notes Due 2022    
Debt    
Aggregate principal amount $ 400.0  
Stated interest rate (percent) 6.625%  
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest, Percentage 100.00%  
Senior Notes | 6.625% Senior Notes Due 2022 | Redemption prior to May 15, 2019 via certain equity offerings    
Debt    
Redemption price as a percentage of principal 100.00%  
Redemption price (percent) 106.625%  
Senior Notes | 6.625% Senior Notes Due 2022 | Minimum | Redemption prior to May 15, 2019 via certain equity offerings    
Debt    
Remaining debt (percent) 65.00%  
Senior Notes | 6.625% Senior Notes Due 2022 | Maximum | Redemption prior to May 15, 2019 via certain equity offerings    
Debt    
Redemption price as a percentage of principal 35.00%  
Senior Notes | 8.5% Senior Notes Due 2019    
Debt    
Aggregate principal amount   $ 200.0
Stated interest rate (percent)   8.50%
Debt retired $ 200.0  
Senior Secured Credit Facility    
Debt    
Debt retired $ 30.0