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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, 2023
Dec. 31, 2022
Sep. 30, 2022
Debt Instrument [Line Items]      
Short-Term Borrowings Outstanding $ 129.5 $ 116.0 $ 72.0
Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving credit facility, limit 200.0 200.0 200.0
Short-Term Borrowings Outstanding 129.5 116.0 72.0
Available revolving credit facility $ 70.5 $ 84.0 $ 128.0