Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets, Net of Accumulated Amortization (Components of Intangible Assets, at Cost) (Details)

v3.10.0.1
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.