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Fair Value Measurements - Carrying Value and Fair Value of Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Carrying Value | Term Loan Facility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   $ 525.0
Carrying Value | Notes [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 2,183.5 1,489.0
Carrying Value | Revolving Credit Facility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 165.0 320.0
Fair Value | Term Loan Facility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   525.0
Fair Value | Notes [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 2,256.0 1,490.4
Fair Value | Revolving Credit Facility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 165.0 $ 320.0