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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, 2020
May 31, 2019
Change in the fair value of plan assets:    
Fair value of plan assets at beginning of year $ 129.9 $ 134.5
Fair value of plan assets at end of year 131.8 129.9
Significant other unobservable inputs (Level 3)    
Change in the fair value of plan assets:    
Fair value of plan assets at beginning of year 22.0 19.9
Purchases 1.8 2.1
Sales (0.1)  
Return on plan assets related to assets still held May 31 0.8  
Fair value of plan assets at end of year 24.5 22.0
Significant other unobservable inputs (Level 3) | Hedge Funds    
Change in the fair value of plan assets:    
Fair value of plan assets at beginning of year 4.2 4.4
Sales (0.1)  
Return on plan assets related to assets still held May 31 0.2 (0.2)
Fair value of plan assets at end of year 4.3 4.2
Significant other unobservable inputs (Level 3) | Funds-of-funds    
Change in the fair value of plan assets:    
Fair value of plan assets at beginning of year 7.9 7.7
Return on plan assets related to assets still held May 31 0.6 0.2
Fair value of plan assets at end of year 8.5 7.9
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 9.9 7.8
Purchases 1.8 2.1
Fair value of plan assets at end of year $ 11.7 $ 9.9