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Employee Benefit Plans - Reconciliation of Level 3 Pension Assets (Details) - Defined Benefit Pension Plans - USD ($)
$ in Millions
12 Months Ended
May 31, 2021
May 31, 2020
Change in the fair value of plan assets:    
Fair value of plan assets at beginning of year $ 131.8 $ 129.9
Fair value of plan assets at end of year 158.4 131.8
Total    
Change in the fair value of plan assets:    
Fair value of plan assets at beginning of year 24.5 22.0
Purchases 3.9 1.8
Sales   (0.1)
Return on plan assets related to assets still held May 31 3.3 0.8
Fair value of plan assets at end of year 31.7 24.5
Significant other unobservable inputs (Level 3) | Insurance Annuities    
Change in the fair value of plan assets:    
Fair value of plan assets at beginning of year 11.7 9.9
Purchases 3.9 1.8
Fair value of plan assets at end of year 15.6 11.7
Measured at net asset value | Hedge Funds    
Change in the fair value of plan assets:    
Fair value of plan assets at beginning of year 4.3 4.2
Sales   (0.1)
Return on plan assets related to assets still held May 31 0.8 0.2
Fair value of plan assets at end of year 5.1 4.3
Measured at net asset value | Fund-of-funds    
Change in the fair value of plan assets:    
Fair value of plan assets at beginning of year 8.5 7.9
Return on plan assets related to assets still held May 31 2.5 0.6
Fair value of plan assets at end of year $ 11.0 $ 8.5