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Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility (Detail) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Short-Term Borrowings Outstanding | $ 30.5 | $ 54.7 | $ 17.3
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility, limit | 120.0 | 120.0 | 120.0
Short-Term Borrowings Outstanding | 30.5 | 54.7 | 17.3
Letter of Credit Outstanding |  | 0.1 | 0.1
Available revolving credit facility | $ 89.5 | $ 65.2 | $ 102.6

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