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Fair Value Measurement - Carrying Value, Net of Underwriting Commissions, Price Discounts, and Debt Issuance Costs and Fair Value of Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Carrying Value | Revolving Credit Facility [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value $ 695.0  
Carrying Value | Term Loan Facilities [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value   $ 279.0
Carrying Value | Notes Payable to Banks [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value   0.8
Carrying Value | Senior Unsecured Notes [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value 890.8 889.7
Fair Value | Revolving Credit Facility [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value 695.0  
Fair Value | Term Loan Facilities [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value   280.0
Fair Value | Notes Payable to Banks [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value   0.8
Fair Value | Senior Unsecured Notes [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value $ 944.5 $ 894.1