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Description of Business, Basis of Presentation, and Significant Accounting Policies (Summary of Accounts Receivable, Net of Allowance for Credit Losses) (Details) - USD ($) $ in Millions | Aug. 31, 2025 | May 31, 2025
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total accounts receivable, gross | $ 1,383.7 | $ 1,356.5
Less: Allowance for credit losses | 24.4 | 26.0
Accounts receivable, net of allowance for credit losses | 1,359.3 | 1,330.5
Trade Receivables [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total accounts receivable, gross | 222.1 | 205.4
Purchased Receivables [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total accounts receivable, gross | $ 1,161.6 | $ 1,151.1

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