Employee Benefit Plans - Reconciliation of Pension Assets (Details) - Defined Benefit Pension Plans - USD ($) $ in Millions	May 31, 2024	May 31, 2023
Quoted prices in active markets (Level 1) | Funds-of-funds
Employee benefit plans
Fair value of plan assets	$ 40.7	$ 39.9
Quoted prices in active markets (Level 1) | Total Investments
Employee benefit plans
Fair value of plan assets	40.7	39.9
Significant other observable inputs (Level 2) | Insurance Annuities
Employee benefit plans
Fair value of plan assets	10.7	10.3
Significant other observable inputs (Level 2) | Total Investments
Employee benefit plans
Fair value of plan assets	10.7	10.3
Significant other unobservable inputs (Level 3) | Funds-of-funds
Employee benefit plans
Fair value of plan assets	40.7	39.9
Significant other unobservable inputs (Level 3) | Insurance Annuities
Employee benefit plans
Fair value of plan assets	10.7	10.3
Significant other unobservable inputs (Level 3) | Total Investments
Employee benefit plans
Fair value of plan assets	$ 51.4	$ 50.2