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Fair Value Measurements - Carrying Value and Fair Value of Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Carrying Value | Term Loan Facility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 525.0  
Carrying Value | Senior Unsecured Notes [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 1,489.0 $ 892.6
Carrying Value | Revolving Credit Facility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 320.0 615.0
Fair Value | Term Loan Facility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 525.0  
Fair Value | Senior Unsecured Notes [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 1,490.4 926.3
Fair Value | Revolving Credit Facility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 320.0 $ 615.0