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Debt and Financing Arrangements - Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Debt Instrument [Line Items]      
Short-Term Borrowings Outstanding $ 64.3 $ 162.0 $ 129.5
Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving credit facility, limit 200.0 200.0 200.0
Short-Term Borrowings Outstanding 64.3 162.0 129.5
Available revolving credit facility $ 135.7 $ 38.0 $ 70.5