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Goodwill and Other Intangibles (Tables) | 6 Months Ended
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Nov. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Activity in Goodwill for the Periods Indicated | The following table summarizes the activity in Goodwill for the periods indicated:
| November 30, 2023 | May 31, 2023 | November 30, 2022
Gross beginning balance | $ | 172.3 |  |  | $ | 164.9 |  |  | $ | 164.9 |  |
Accumulated impairment |  | (39.6) |  |  |  | (39.6) |  |  |  | (39.6) |  |
Beginning balance | $ | 132.7 |  |  | $ | 125.3 |  |  | $ | 125.3 |  |
Additions |  | — |  |  |  | 7.6 |  |  |  | 7.0 |  |
Foreign currency translation |  | 0.1 |  |  |  | (0.2) |  |  |  | (0.3) |  |
Ending balance | $ | 132.8 |  |  | $ | 132.7 |  |  | $ | 132.0 |  |
Summary of Activity in Total Other Intangibles for the Periods Indicated | The following table summarizes the activity in other intangibles included in Other assets and deferred charges on the Company’s Financial Statements for the periods indicated:
| November 30, 2023 | May 31, 2023 | November 30, 2022
Beginning balance - Other intangibles subject to amortization | $ | 7.8 |  |  | $ | 6.0 |  |  | $ | 6.0 |  |
Additions |  | 5.8 |  |  |  | 4.1 |  |  |  | 4.1 |  |
Amortization expense |  | (1.2) |  |  |  | (2.2) |  |  |  | (1.1) |  |
Foreign currency translation |  | 0.0 |  |  |  | (0.1) |  |  |  | (0.1) |  |
Total other intangibles subject to amortization, net of accumulated amortization of $37.7, $36.5 and $35.4, respectively | $ | 12.4 |  |  | $ | 7.8 |  |  | $ | 8.9 |  |
Total other intangibles not subject to amortization | $ | 2.1 |  |  | $ | 2.1 |  |  | $ | 2.1 |  |
Total other intangibles | $ | 14.5 |  |  | $ | 9.9 |  |  | $ | 11.0 |  |

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