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Debt and Financing Arrangements - Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Short-Term Borrowings Outstanding $ 105.8 $ 162.0
Revolving Credit Facility    
Debt Instrument [Line Items]    
Revolving credit facility, limit 200.0 200.0
Short-Term Borrowings Outstanding 105.8 162.0
Available revolving credit facility $ 94.2 $ 38.0