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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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May 31, 2021
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:
| 2021 |  | 2020 |  | 2019
| 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 |  |  | $ | (0.6) |  |  | $ | 0.0 |  |  | $ | (0.2) |  |  | $ | 0.0 |  |  | $ | (0.1) |
Amortization of net actuarial loss (gain) |  | 0.6 |  |  |  | 0.0 |  |  |  | 1.0 |  |  |  | — |  |  |  | 0.8 |  |  |  | — |
Tax (benefit) expense |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | 0.0 |  |  |  | — |  |  |  | 0.0 |
Amounts reclassified from Accumulated other comprehensive income (loss) | $ | 0.6 |  |  | $ | (0.5) |  |  | $ | 1.0 |  |  | $ | (0.2) |  |  | $ | 0.8 |  |  | $ | (0.1) |
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, 2019 (1) | $ | (47.1) |  |  | $ | (13.1) |  |  | $ | 0.5 |  |  | $ | (59.7) |
Other comprehensive income (loss) before reclassifications | $ | (2.9) |  |  | $ | 2.5 |  |  | $ | 1.0 |  |  | $ | 0.6 |
Less: amount reclassified from Accumulated other comprehensive income (loss) (net of taxes) |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss | $ | — |  |  | $ | 1.0 |  |  | $ | — |  |  | $ | 1.0 |
Amortization of prior service (credit) cost |  | — |  |  |  | — |  |  |  | (0.2) |  |  |  | (0.2) |
Other comprehensive income (loss) |  | (2.9) |  |  |  | 3.5 |  |  |  | 0.8 |  |  |  | 1.4 |
Balance at May 31, 2020 (1) | $ | (50.0) |  |  | $ | (9.6) |  |  | $ | 1.3 |  |  | $ | (58.3) |
Other comprehensive income (loss) before reclassifications | $ | 19.9 |  |  | $ | (1.4) |  |  | $ | 5.0 |  |  | $ | 23.5 |
Less: amount reclassified from Accumulated other comprehensive income (loss) (net of taxes) |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss | $ | — |  |  | $ | 0.6 |  |  | $ | 0.0 |  |  | $ | 0.6 |
Amortization of prior service (credit) cost |  | — |  |  |  | 0.0 |  |  |  | (0.5) |  |  |  | (0.5) |
Other comprehensive income (loss) |  | 19.9 |  |  |  | (0.8) |  |  |  | 4.5 |  |  |  | 23.6 |
Balance at May 31, 2021 (1) | $ | (30.1) |  |  | $ | (10.4) |  |  | $ | 5.8 |  |  | $ | (34.7) |
(1) Accumulated other comprehensive income (loss) related to the UK Pension Plan and US Postretirement Benefits are reported net of taxes of $2.0, $0.1 and $0.5 at May 31, 2021, 2020, and 2019, respectively.

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