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Long-Term Debt - Summary of third quarter and year to date actions (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Aug. 07, 2017
Jul. 26, 2017
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2017
Oct. 27, 2014
Debt Instrument [Line Items]            
Net borrowings     $ 53,000,000      
Principal prepayment of outstanding debt balance         $ 187,000,000  
Revolving Credit Facility            
Debt Instrument [Line Items]            
Term Loan A borrowings     500,000,000   $ 500,000,000 $ 250,000,000
Credit facility borrowings     235,000,000      
Term Loan            
Debt Instrument [Line Items]            
Principal prepayment of outstanding debt balance   $ 75,000,000        
Term Loan | Term Loan A            
Debt Instrument [Line Items]            
Term Loan A borrowings   $ 688,000,000        
Term Loan | Term Loan B            
Debt Instrument [Line Items]            
Term loan principal prepayments     $ 120,000,000 $ 240,000,000    
Senior Notes | Senior Note debt            
Debt Instrument [Line Items]            
Senior Note debt principal prepayments $ 750,000,000