Employee Benefit Plans - Reconciliation of Pension Assets (Details) - Defined Benefit Pension Plans - USD ($) $ in Millions	May 31, 2025	May 31, 2024
Quoted prices in active markets (Level 1) | Funds-of-funds
Employee benefit plans
Fair value of plan assets	$ 42.2	$ 40.7
Quoted prices in active markets (Level 1) | Total Investments
Employee benefit plans
Fair value of plan assets	42.2	40.7
Significant other observable inputs (Level 2) | Insurance Annuities
Employee benefit plans
Fair value of plan assets	11.4	10.7
Significant other observable inputs (Level 2) | Total Investments
Employee benefit plans
Fair value of plan assets	11.4	10.7
Significant other unobservable inputs (Level 3) | Funds-of-funds
Employee benefit plans
Fair value of plan assets	42.2	40.7
Significant other unobservable inputs (Level 3) | Insurance Annuities
Employee benefit plans
Fair value of plan assets	11.4	10.7
Significant other unobservable inputs (Level 3) | Total Investments
Employee benefit plans
Fair value of plan assets	$ 53.6	$ 51.4