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External Debt and Financing Arrangements - Components of External Long-Term Debt (Parenthetical) (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Debt instrument face amount       $ 900,000,000
Term Loan Facilities [Member]        
Debt Instrument [Line Items]        
Debt instrument face amount $ 525,000,000 $ 525,000,000    
Notes Due June Twenty Twenty [Member] | Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Debt instrument face amount $ 400,000,000      
Debt instrument, maturity date 2020-06      
Notes Due June Twenty Twenty Five [Member] | Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Debt instrument face amount $ 500,000,000      
Debt instrument, maturity date 2025-06      
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 1,250,000,000 $ 1,250,000,000    
Revolving credit facility, expiration date 2021-07 2021-07    
Revolving Credit Facility [Member] | Amended and Restated Credit Agreement [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 1,250,000,000   $ 1,250,000,000