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Fair Value Measurements - Carrying Value and Fair Value of Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Revolving Credit Facility [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Carrying Value $ 0.0 $ 145.0
Fair Value   145.0
Term Loan Facilities [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Carrying Value 450.0 525.0
Fair Value 450.0 $ 525.0
Senior Unsecured Notes [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Carrying Value 891.4  
Fair Value $ 904.4