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Commitments and Contingencies - Operating Lease, Rental Expense, Purchase Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Aggregate amount of purchase obligations due in each of the next five fiscal years      
2017 $ 186.0    
2018 31.3    
2019 6.6    
2020 0.4    
2021 2.7    
Letters of credit and performance bonds outstanding 12.3    
Facilities and Equipment      
Future minimum payments under operating leases      
2017 26.0    
2018 21.2    
2019 17.3    
2020 15.4    
2021 14.8    
2022 and thereafter 53.8    
Rental expense      
Rental expense, net $ 33.1 $ 33.3 $ 30.6