Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets, Net of Accumulated Amortization (Narrative) (Details)

v3.7.0.1
Goodwill and Intangible Assets, Net of Accumulated Amortization (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 657.1 $ 657.1  
Amortization expense $ 18.1 $ 15.9 $ 14.5
Client Lists [Member]      
Finite-Lived Intangible Assets [Line Items]      
Acquired intangible assets with weighted-average amortization periods 8 years