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Employee Benefit Plans - Schedule for measurement of benefit plan assets at fair value (Details) - Pension Plans - USD ($) $ in Millions | May 31, 2026 | May 31, 2025 | May 31, 2024
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 29.5 | $ 20.1 |
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.8 |
Pooled, Common and Collective Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 7.6 |
Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 8.6 |
Annuities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 29.5 | 3.1 |
UNITED KINGDOM |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 29.5 | 20.1 | $ 21.4
UNITED KINGDOM | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.8 |
UNITED KINGDOM | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.8 |
UNITED KINGDOM | Level 1 | Pooled, Common and Collective Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
UNITED KINGDOM | Level 1 | Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
UNITED KINGDOM | Level 1 | Annuities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
UNITED KINGDOM | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 16.2 |
UNITED KINGDOM | Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
UNITED KINGDOM | Level 2 | Pooled, Common and Collective Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 7.6 |
UNITED KINGDOM | Level 2 | Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 8.6 |
UNITED KINGDOM | Level 2 | Annuities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
UNITED KINGDOM | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 29.5 | 3.1 |
UNITED KINGDOM | Level 3 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
UNITED KINGDOM | Level 3 | Pooled, Common and Collective Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
UNITED KINGDOM | Level 3 | Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
UNITED KINGDOM | Level 3 | Annuities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 29.5 | $ 3.1 |

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