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Fair Value Measurements - Carrying Value and Fair Value of Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Carrying Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt $ 3,357.9 $ 2,709.8
Carrying Value [Member] | Senior Notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 2,671.5 1,789.8
Carrying Value [Member] | 2019 Revolving Credit Agreement [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 125.0 520.0
Carrying Value [Member] | Commercial Paper Borrowings [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 561.4 0.0
Carrying Value [Member] | 2021 Term Loan [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 0.0 400.0
Fair Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 3,132.0 2,822.9
Fair Value [Member] | Senior Notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 2,445.6 1,902.9
Fair Value [Member] | 2019 Revolving Credit Agreement [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 125.0 520.0
Fair Value [Member] | Commercial Paper Borrowings [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 561.4 0.0
Fair Value [Member] | 2021 Term Loan [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt $ 0.0 $ 400.0