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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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May 31, 2026
Equity [Abstract] |
Reclassification out of Accumulated Other Comprehensive Income | The following table presents the impact on earnings of reclassifications out of Accumulated other comprehensive income (loss) for the fiscal years ended May 31:
| 2026 |  | 2025 |  | 2024
| UK Pension Plan |  | US Postretirement Benefits |  | UK Pension Plan |  | US Postretirement Benefits |  | UK Pension Plan |  | US Postretirement Benefits
Amortization of prior service (credit) loss | $ | 0.0 |  |  | $ | (0.8) |  |  | $ | 0.0 |  |  | $ | (0.8) |  |  | $ | 0.0 |  |  | $ | (0.8) |
Amortization of net actuarial loss (gain) |  | 1.7 |  |  |  | (0.1) |  |  |  | 1.4 |  |  |  | (0.1) |  |  |  | 1.3 |  |  |  | 0.0 |
Tax (benefit) expense |  | — |  |  |  | 0.2 |  |  |  | — |  |  |  | 0.2 |  |  |  | — |  |  |  | 0.2 |
Amounts reclassified from Accumulated other comprehensive income (loss) | $ | 1.7 |  |  | $ | (0.7) |  |  | $ | 1.4 |  |  | $ | (0.7) |  |  | $ | 1.3 |  |  | $ | (0.6) |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following tables summarize the activity in Accumulated other comprehensive income (loss), net of tax, by component for the periods indicated:
| Foreign currency translation adjustments |  | UK Pension Plan |  | US Postretirement Benefits |  | Total
Balance at May 31, 2024 (1) | $ | (46.9) |  |  | $ | (11.8) |  |  | $ | 6.2 |  |  | $ | (52.5) |
Other comprehensive income (loss) before reclassifications | $ | 10.9 |  |  | $ | (0.6) |  |  | $ | 0.0 |  |  | $ | 10.3 |
Less: amounts reclassified from Accumulated other comprehensive income (loss) (net of taxes) |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss | $ | — |  |  | $ | 1.4 |  |  | $ | (0.1) |  |  | $ | 1.3 |
Amortization of prior service (credit) cost |  | — |  |  |  | 0.0 |  |  |  | (0.6) |  |  |  | (0.6) |
Other comprehensive income (loss) |  | 10.9 |  |  |  | 0.8 |  |  |  | (0.7) |  |  |  | 11.0 |
Balance at May 31, 2025 (1) | $ | (36.0) |  |  | $ | (11.0) |  |  | $ | 5.5 |  |  | $ | (41.5) |
Other comprehensive income (loss) before reclassifications | $ | 4.7 |  |  | $ | (3.4) |  |  | $ | (0.2) |  |  | $ | 1.1 |
Less: amounts reclassified from Accumulated other comprehensive income (loss) (net of taxes) |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustment related to sale of equity method investment (2) |  | 3.5 |  |  |  | — |  |  |  | — |  |  |  | 3.5 |
Amortization of net actuarial loss | $ | — |  |  | $ | 1.7 |  |  | $ | (0.1) |  |  | $ | 1.6 |
Amortization of prior service (credit) cost |  | — |  |  |  | 0.0 |  |  |  | (0.6) |  |  |  | (0.6) |
Other comprehensive income (loss) |  | 8.2 |  |  |  | (1.7) |  |  |  | (0.9) |  |  |  | 5.6 |
Balance at May 31, 2026 (1) | $ | (27.8) |  |  | $ | (12.7) |  |  | $ | 4.6 |  |  | $ | (35.9) |
(1) Accumulated other comprehensive income (loss) related to the UK Pension Plan and the US Postretirement Benefits are reported net of taxes of $1.5, $1.8 and $2.0 at May 31, 2026, 2025, and 2024, respectively.

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