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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

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