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Fair Value Measurements - Carrying Value and Fair Value of Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Carrying Value | Term Loan Facility [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value $ 525.0  
Carrying Value | Senior Unsecured Notes [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value 1,488.4 $ 892.6
Carrying Value | Revolving Credit Facility [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value 500.0 615.0
Fair Value | Term Loan Facility [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value 525.0  
Fair Value | Senior Unsecured Notes [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value 1,490.8 926.3
Fair Value | Revolving Credit Facility [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair Value $ 500.0 $ 615.0