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External Debt and Financing Arrangements - Components of External Long-Term Debt (Detail) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term debt $ 1,431,100,000 $ 1,168,700,000
Less: current portion 0 0
Total long-term debt 1,431,100,000 1,168,700,000
Senior Unsecured Notes [Member] | Notes Due June Twenty Twenty [Member]    
Debt Instrument [Line Items]    
Long-term debt 397,600,000 396,900,000
Senior Unsecured Notes [Member] | Notes Due June Twenty Twenty Five [Member]    
Debt Instrument [Line Items]    
Long-term debt 493,500,000 492,800,000
Term Loan Facilities [Member]    
Debt Instrument [Line Items]    
Long-term debt [1]   $ 279,000,000
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt 540,000,000  
Less: current portion $ 0  
[1] In 2016, the Company amended and restated its credit agreement to combine and rollover the existing revolving credit facility and term loan into a new standalone $1.25 billion revolving credit facility.