Quarterly report pursuant to Section 13 or 15(d)

Debt - Schedule of Long-term Debt Instruments Additional Information (Details)

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Debt - Schedule of Long-term Debt Instruments Additional Information (Details) - USD ($)
1 Months Ended 6 Months Ended
Dec. 31, 2012
Jun. 30, 2016
May 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Senior Secured Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt instrument, term 5 years        
Credit facility, maximum borrowing capacity $ 1,250,000,000 $ 1,750,000,000     $ 1,750,000,000
Credit facility, unused capacity, commitment fee percentage   0.30%      
Credit facility, remaining borrowing capacity   $ 1,750,000,000      
Senior Notes | 5.375% Senior Notes Due 2026          
Debt Instrument [Line Items]          
Principal amount   $ 1,000,000,000 $ 1,000,000,000    
Debt discount     $ 11,250,000    
Stated interest rate   5.375% 5.375%    
Senior Secured Notes | 5.25% Senior Notes Due 2022          
Debt Instrument [Line Items]          
Principal amount   $ 400,000,000      
Stated interest rate   5.25%   5.25%