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Fair Value Measurements - Carrying Value and Fair Value of Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Carrying Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt $ 2,829.3 $ 2,673.5
Carrying Value [Member] | Senior Notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 2,669.4 2,673.5
Carrying Value [Member] | 2022 Revolving Credit Agreement [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 110.0 0.0
Carrying Value [Member] | Commercial Paper Borrowings [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 49.9 0.0
Fair Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 2,538.5 2,412.6
Fair Value [Member] | Senior Notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 2,378.6 2,412.6
Fair Value [Member] | 2022 Revolving Credit Agreement [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt 110.0 0.0
Fair Value [Member] | Commercial Paper Borrowings [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Debt $ 49.9 $ 0.0