Summary of Significant Accounting Policies - Financial Instruments (Details) - USD ($) $ in Millions |
May 31, 2026 |
May 31, 2025 |
|---|---|---|
| Accounts Receivable | ||
| Accounts receivable, less allowances of $13.3 and $10.7, respectively | $ 386.8 | $ 354.8 |
| U.S. government contracts | ||
| Accounts Receivable | ||
| Accounts receivable, less allowances of $13.3 and $10.7, respectively | 41.3 | 40.0 |
| U.S. government contracts | Trade receivables | ||
| Accounts Receivable | ||
| Trade receivables | 32.5 | 26.6 |
| U.S. government contracts | Unbilled receivables | ||
| Accounts Receivable | ||
| Unbilled receivables | 8.8 | 13.4 |
| All other customers | ||
| Accounts Receivable | ||
| Accounts receivable, less allowances of $13.3 and $10.7, respectively | 345.5 | 314.8 |
| All other customers | Trade receivables | ||
| Accounts Receivable | ||
| Trade receivables | 318.5 | 283.4 |
| All other customers | Unbilled receivables | ||
| Accounts Receivable | ||
| Unbilled receivables | $ 27.0 | $ 31.4 |