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
Feb. 29, 2016
May. 31, 2015
Components of intangible assets, at cost    
Client lists $ 289.1 $ 244.6
Other intangible assets 5.5 3.2
Total intangible assets, gross 294.6 247.8
Less: Accumulated amortization 221.1 215.4
Intangible assets, net of accumulated amortization 73.5 $ 32.4
Estimated future amortization expense relating to intangible assets    
Fiscal year ending May 31, 2016 16.6  
Fiscal year ending May 31, 2017 17.5  
Fiscal year ending May 31, 2018 13.9  
Fiscal year ending May 31, 2019 10.9  
Fiscal year ending May 31, 2020 $ 8.4