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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions | Aug. 31, 2023 | May 31, 2023
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Senior Notes, Series A [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of long-term borrowings | $ 389.2 | $ 392.4
Senior Notes, Series B [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of long-term borrowings | $ 385.7 | $ 390.9

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