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Employee Benefit Plans - Future Benefit Payments and Defined Contribution Plan (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Defined Contribution Plan      
Vesting period 3 years    
Expense charged to statement of income $ 12.7 $ 11.2 $ 12.1
Maximum      
Defined Contribution Plan      
Maximum percentage of pretax compensation that can be contributed by employees' for 401 (k) defined contribution plan 75.00%    
Maximum matching contribution of employer for 401 (k) defined contribution plan (as a percent) 5.00%    
Defined Benefit Pension Plans      
Estimated future pension payments      
2018 $ 8.9    
2019 5.6    
2020 6.2    
2021 5.9    
2022 5.9    
2023 to 2027 35.0    
Funded status      
Unfunded projected benefit obligation 26.6 34.7  
Domestic plans      
Estimated future pension payments      
Anticipated contribution in next fiscal year 9.5    
Postretirement Benefits Other Than Pensions      
Funded status      
Unfunded projected benefit obligation $ 0.7 $ 0.9