Annual report pursuant to Section 13 and 15(d)

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

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Goodwill and Intangible Assets, Net of Accumulated Amortization (Details) - USD ($)
$ in Millions
May. 31, 2015
May. 31, 2014
Components of intangible assets, at cost    
Client lists $ 244.6 $ 240.9
Other intangible assets 3.2 2.6
Total intangible assets, gross 247.8 243.5
Less: Accumulated amortization 215.4 202.9
Intangible assets, net of accumulated amortization 32.4 $ 40.6
Estimated future amortization expense relating to intangible assets    
Fiscal year ending May 31, 2016 11.3  
Fiscal year ending May 31, 2017 8.2  
Fiscal year ending May 31, 2018 5.5  
Fiscal year ending May 31, 2019 3.6  
Fiscal year ending May 31, 2020 $ 2.0