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Debt (Details 2) - USD ($)
Oct. 06, 2014
Mar. 31, 2016
The 2022 Notes    
Debt    
Principal amount $ 800,000,000  
Interest rate (as a percent) 5.75%  
Fair value of debt instrument   $ 820,000,000
The 2024 Notes    
Debt    
Principal amount $ 800,000,000  
Interest rate (as a percent) 5.875%  
Fair value of debt instrument   $ 820,000,000
Redemption period one | The 2022 Notes    
Debt    
Redemption period, end date Oct. 15, 2017  
Percentage price of original principal amount of note, excluding required premium, at which note can be redeemed 100.00%  
Percentage price of original principal amount of note at which note can be redeemed 105.75%  
Redemption period two | The 2024 Notes    
Debt    
Redemption period, end date Jul. 15, 2024  
Percentage price of original principal amount of note, excluding required premium, at which note can be redeemed 100.00%  
Redemption period three | The 2024 Notes    
Debt    
Redemption period, start date Jul. 15, 2024  
Percentage price of original principal amount of note at which note can be redeemed 100.00%  
Maximum | Redemption period one | The 2022 Notes    
Debt    
Percentage of principal amount that can be redeemed 35.00%