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Fair Value Measurements - Carrying Value and Fair Value of Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Carrying Value | Term Loan Facility [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 525.0
Carrying Value | Senior Unsecured Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 2,184.3 1,489.0
Fair Value | Term Loan Facility [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   525.0
Fair Value | Senior Unsecured Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 2,271.4 1,490.4
Revolving Credit Facility [Member] | Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   320.0
Revolving Credit Facility [Member] | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 320.0