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Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Debt Instrument [Line Items]      
Short-Term Borrowings Outstanding $ 46.2 $ 64.1 $ 29.7
Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving credit facility, limit 120.0 120.0 120.0
Short-Term Borrowings Outstanding 46.2 64.1 29.7
Available revolving credit facility $ 73.8 $ 55.9 $ 90.3