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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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May 31, 2023
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:
| 2023 |  | 2022 |  | 2021
| 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 |  |  | $ | (0.6) |
Amortization of net actuarial loss (gain) |  | 0.5 |  |  |  | — |  |  |  | 0.9 |  |  |  | — |  |  |  | 0.6 |  |  |  | — |
Tax (benefit) expense |  | — |  |  |  | 0.2 |  |  |  | — |  |  |  | 0.2 |  |  |  | — |  |  |  | 0.1 |
Amounts reclassified from Accumulated other comprehensive income (loss) | $ | 0.5 |  |  | $ | (0.6) |  |  | $ | 0.9 |  |  | $ | (0.6) |  |  | $ | 0.6 |  |  | $ | (0.5) |
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, 2021 (1) | $ | (30.1) |  |  | $ | (10.4) |  |  | $ | 5.8 |  |  | $ | (34.7) |
Other comprehensive income (loss) before reclassifications | $ | (14.5) |  |  | $ | 2.1 |  |  | $ | 1.4 |  |  | $ | (11.0) |
Less: amount reclassified from Accumulated other comprehensive income (loss) (net of taxes) |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss | $ | — |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | 0.9 |
Amortization of prior service (credit) cost |  | — |  |  |  | 0.0 |  |  |  | (0.6) |  |  |  | (0.6) |
Other comprehensive income (loss) |  | (14.5) |  |  |  | 3.0 |  |  |  | 0.8 |  |  |  | (10.7) |
Balance at May 31, 2022 (1) | $ | (44.6) |  |  | $ | (7.4) |  |  | $ | 6.6 |  |  | $ | (45.4) |
Other comprehensive income (loss) before reclassifications | $ | (5.4) |  |  | $ | (5.5) |  |  | $ | 0.6 |  |  | $ | (10.3) |
Less: amount reclassified from Accumulated other comprehensive income (loss) (net of taxes) |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss | $ | — |  |  | $ | 0.5 |  |  | $ | — |  |  | $ | 0.5 |
Amortization of prior service (credit) cost |  | — |  |  |  | 0.0 |  |  |  | (0.6) |  |  |  | (0.6) |
Other comprehensive income (loss) |  | (5.4) |  |  |  | (5.0) |  |  |  | 0.0 |  |  |  | (10.4) |
Balance at May 31, 2023 (1) | $ | (50.0) |  |  | $ | (12.4) |  |  | $ | 6.6 |  |  | $ | (55.8) |
(1) Accumulated other comprehensive income (loss) related to the UK Pension Plan and US Postretirement Benefits are reported net of taxes of $2.2, $2.2 and $2.0 at May 31, 2023, 2022, and 2021, respectively.

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