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Commitments and Contingencies - Operating Lease, Rental Expense, Purchase Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Aggregate amount of purchase obligations due in each of the next five fiscal years      
2018 $ 231.2    
2019 37.7    
2020 1.4    
2021 2.7    
2022 0.0    
Letters of credit and performance bonds outstanding 13.6    
Facilities and Equipment      
Future minimum payments under operating leases      
2018 24.0    
2019 18.1    
2020 16.5    
2021 14.4    
2022 13.5    
2023 and thereafter 40.0    
Rental expense      
Rental expense, net $ 31.9 $ 33.5 $ 33.7