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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, 2025
Dec. 31, 2024
Sep. 30, 2024
Debt Instrument [Line Items]      
Short-Term Borrowings Outstanding $ 117.5 $ 105.8 $ 64.3
Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving Credit Facility, Limit 275.0 200.0 200.0
Short-Term Borrowings Outstanding 117.5 105.8 64.3
Available Revolving Credit Facility $ 157.5 $ 94.2 $ 135.7