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Employee Benefit Plans (Details 3) - USD ($)
$ in Millions
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Defined Contribution Plan      
Vesting period 3 years    
Expense charged to statement of income $ 11.9 $ 11.8 $ 13.0
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      
2016 $ 10.5    
2017 5.3    
2018 5.8    
2019 5.5    
2020 5.9    
2021 to 2025 31.6    
Funded status      
Unfunded projected benefit obligation 29.1 25.9  
Domestic plans      
Estimated future pension payments      
Anticipated contribution in next fiscal year 3.5    
Postretirement Benefits Other Than Pensions      
Funded status      
Unfunded projected benefit obligation $ 1.0 $ 0.9