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Commitments and Contingencies - Operating Lease, Rental Expense, Purchase Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Aggregate amount of purchase obligations due in each of the next five fiscal years      
2019 $ 203.4    
2020 43.8    
2021 6.0    
2022 0.0    
2023 0.0    
Letters of credit and performance bonds outstanding 16.7    
Facilities and Equipment      
Future minimum payments under operating leases      
2019 17.5    
2020 16.3    
2021 13.0    
2022 10.8    
2023 10.0    
2024 and thereafter 27.2    
Rental expense      
Rental expense, net $ 23.5 $ 22.9 $ 21.3