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Employee Benefit Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Feb. 28, 2021
Employee Benefit Plans (Details) [Line Items]        
Reduction in benefit obligation       $ 7.6
Amount recognized in Accumulated comprehensive income (loss) net of tax       $ 7.6
Remaining life of plan 12 years      
Percentage of federal subsidy to sponsors of retiree health care benefit plans 28.00%      
Cumulative reduction of its accumulated post-retirement benefit obligation $ 0.2 $ 1.2 $ 1.5  
Defined benefit plans tax expense recognized in AOCI 2.0 (0.1) (0.5)  
Estimated employer contributions in 2015 1.7      
Contribution to retirement plan 6.0 6.7 7.6  
Annuities | Level 3        
Employee Benefit Plans (Details) [Line Items]        
Fair value of annuities 6.0 5.6    
U.S. | Other Postretirement Benefits        
Employee Benefit Plans (Details) [Line Items]        
Reduction in benefit obligation $ 12.1 $ 20.8 $ 23.4  
Expected long-term return on plan assets 0.00% 0.00% 0.00%  
U.K. | Pension Plans        
Employee Benefit Plans (Details) [Line Items]        
Reduction in benefit obligation $ 47.0 $ 41.7 $ 40.9  
Expected long-term return on plan assets 2.20% 3.10% 3.40%