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Commitments and Contingencies (Details 2) - USD ($)
$ in Millions
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Future minimum payments under operating leases      
2016 $ 222.6    
2017 15.2    
Aggregate amount of purchase obligations due in each of the next five fiscal years      
2018 4.1    
2019 0.1    
2020 0.1    
Letters of credit and performance bonds outstanding 15.4    
Facilities and Equipment      
Future minimum payments under operating leases      
2016 19.7    
2017 15.6    
2018 11.3    
2019 9.9    
2020 9.4    
2021 and thereafter 38.0    
Rental expense      
Rental expense, net $ 33.3 $ 30.6 $ 30.0