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Debt - 2014 and 2017 Senior Notes (Details) - USD ($)
Feb. 21, 2017
Oct. 06, 2014
Jun. 30, 2017
2014 Senior Notes | The 2022 Notes      
Debt      
Principal amount   $ 800,000,000  
Interest rate (as a percent)   5.75%  
2014 Senior Notes | The 2022 Notes | Level 2      
Debt      
Fair value of debt instrument     $ 839,000,000
2014 Senior Notes | The 2022 Notes | Prior to October 15, 2017      
Debt      
Redemption price percentage   100.00%  
Percentage price of original principal amount of note, excluding required premium, at which note can be redeemed   105.75%  
2014 Senior Notes | The 2024 Notes      
Debt      
Principal amount   $ 800,000,000  
Interest rate (as a percent)   5.875%  
2014 Senior Notes | The 2024 Notes | Level 2      
Debt      
Fair value of debt instrument     $ 868,000,000
2014 Senior Notes | The 2024 Notes | Prior to July 15 2024      
Debt      
Redemption price percentage   100.00%  
2014 Senior Notes | The 2024 Notes | On or after July 15, 2024      
Debt      
Redemption price percentage   100.00%  
2017 Senior Notes      
Debt      
Principal amount $ 1,000,000,000    
Interest rate (as a percent) 5.125%   5.125%
Long-term Debt     $ 926,000
2017 Senior Notes | Term loan A      
Debt      
Amount of debt redeemed $ 600,000,000    
2017 Senior Notes | Term loan B      
Debt      
Amount of debt redeemed 127,600,000    
2017 Senior Notes | Revolving credit facility      
Debt      
Amount of debt redeemed $ 250,000,000    
2017 Senior Notes | Level 2      
Debt      
Fair value of debt instrument     1,003,800,000
2017 Senior Notes | Prior to December 15, 2026      
Debt      
Redemption price percentage 100.00%    
2017 Senior Notes | Prior to March 15, 2020      
Debt      
Percentage price of original principal amount of note, excluding required premium, at which note can be redeemed 105.125%    
2017 Senior Notes | On or after December 15, 2026      
Debt      
Redemption price percentage 100.00%    
Registered Senior Notes 2017      
Debt      
Principal amount     $ 999,074,000
Maximum | 2014 Senior Notes | The 2022 Notes | Prior to October 15, 2017      
Debt      
Percentage of principal amount that can be redeemed   35.00%  
Maximum | 2017 Senior Notes | Prior to March 15, 2020      
Debt      
Percentage of principal amount that can be redeemed 35.00%