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Goodwill and Intangible Assets, Net of Accumulated Amortization (Components of Intangible Assets, at Cost) (Details) - USD ($)
$ in Millions
Feb. 28, 2017
May 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 299.6 $ 294.6
Less: Accumulated amortization 237.6 225.1
Intangible assets, net of accumulated amortization 62.0 69.5
Client Lists [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets, gross 294.2 289.2
Other Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 5.4 $ 5.4