Quarterly report pursuant to Section 13 or 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
Aug. 31, 2015
May. 31, 2015
Components of intangible assets, at cost    
Client lists $ 247.9 $ 244.6
Other intangible assets 3.2 3.2
Total intangible assets, gross 251.1 247.8
Less: Accumulated amortization 218.1 215.4
Intangible assets, net of accumulated amortization 33.0 $ 32.4
Estimated future amortization expense relating to intangible assets    
Fiscal year ending May 31, 2016 12.0  
Fiscal year ending May 31, 2017 8.9  
Fiscal year ending May 31, 2018 6.1  
Fiscal year ending May 31, 2019 4.1  
Fiscal year ending May 31, 2020 $ 2.4