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Fair Value Measurements - Carrying Value and Fair Value of Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Carrying Value | Term Loan Facility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 350.0 $ 525.0
Carrying Value | Senior Unsecured Notes [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 1,489.7 1,489.0
Carrying Value | Revolving Credit Facility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 680.0 320.0
Fair Value | Term Loan Facility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 350.0 525.0
Fair Value | Senior Unsecured Notes [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 1,524.4 1,490.4
Fair Value | Revolving Credit Facility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 680.0 $ 320.0