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Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility (Detail) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Short-Term Borrowings Outstanding | $ 140.2 | $ 116.0 | $ 64.0
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility, limit | 200.0 | 200.0 | 120.0
Short-Term Borrowings Outstanding | 140.2 | 116.0 | 64.0
Available revolving credit facility | $ 59.8 | $ 84.0 | $ 56.0

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