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, unless otherwise specified
Nov. 30, 2013
May 31, 2013
Components of intangible assets, at cost    
Client lists $ 236.2 $ 231.0
Other intangible assets 2.6 2.4
Total intangible assets, gross 238.8 233.4
Less: Accumulated amortization 195.2 188.2
Intangible assets, net of accumulated amortization 43.6 45.2
Estimated future amortization expense relating to intangible assets    
Fiscal year ending May 31, 2014 15.7  
Fiscal year ending May 31, 2015 12.0  
Fiscal year ending May 31, 2016 8.8  
Fiscal year ending May 31, 2017 6.3  
Fiscal year ending May 31, 2018 $ 4.2