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Summary of Significant Accounting Policies - Financial Instruments (Details) - USD ($) $ in Millions | May 31, 2025 | May 31, 2024
--- | --- | ---
Accounts Receivable |  |
Accounts receivable, less allowances of $10.1 and $14.1, respectively | $ 354.8 | $ 287.2
U.S. Government contracts |  |
Accounts Receivable |  |
Accounts receivable, less allowances of $10.1 and $14.1, respectively | 40.0 | 43.8
U.S. Government contracts | Trade receivables |  |
Accounts Receivable |  |
Trade receivables | 26.6 | 34.4
U.S. Government contracts | Unbilled receivables |  |
Accounts Receivable |  |
Unbilled receivables | 13.4 | 9.4
All other customers |  |
Accounts Receivable |  |
Accounts receivable, less allowances of $10.1 and $14.1, respectively | 314.8 | 243.4
All other customers | Trade receivables |  |
Accounts Receivable |  |
Trade receivables | 283.4 | 216.1
All other customers | Unbilled receivables |  |
Accounts Receivable |  |
Unbilled receivables | $ 31.4 | $ 27.3

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