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Goodwill and Intangible Assets, Net of Accumulated Amortization (Components of Intangible Assets, at Cost) (Details) - USD ($)
$ in Millions
May 31, 2018
May 31, 2017
Intangible Assets [Line Items]    
Total intangible assets, gross $ 321.8 $ 298.9
Less: Accumulated amortization 180.4 241.3
Intangible assets, net of accumulated amortization 141.4 57.6
Cost to acquire rights to client lists 30.0  
Client Lists [Member]    
Intangible Assets [Line Items]    
Total intangible assets, gross [1] 308.5 293.5
Other Intangible Assets [Member]    
Intangible Assets [Line Items]    
Total intangible assets, gross $ 13.3 $ 5.4
[1] During fiscal 2018, the Company resolved a contractual dispute within certain licensees. As part of this agreement, the Company acquired rights to certain client lists for approximately $30.0 million. Refer to Note P for further details. In addition, the balance as of May 31, 2018 includes client lists from the HROI and Lessor acquisitions. Refer to Note C for further details.