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Fair Value Measurements - Carrying Value and Fair Value of Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Carrying Value [Member] | Senior Notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Debt $ 1,789.8 $ 1,787.2
Carrying Value [Member] | 2019 Revolving Credit Agreement [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Debt 520.0 785.0
Carrying Value [Member] | 2021 Term Loan [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Debt 400.0  
Fair Value [Member] | Senior Notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Debt 1,902.9 1,994.9
Fair Value [Member] | 2019 Revolving Credit Agreement [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Debt 520.0 $ 785.0
Fair Value [Member] | 2021 Term Loan [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Debt $ 400.0