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
 3 Months Ended
Aug. 31, 2011
May 31, 2011
Components of intangible assets, at cost    
Client lists $ 223.2 $ 223.4
Other intangible assets 2.0 2.0
Total intangible assets, gross 225.2 225.4
Less: Accumulated amortization 153.9 148.2
Intangible assets, net of accumulated amortization 71.3 77.2
Estimated future amortization expense relating to intangible assets    
2012 22.9  
2013 17.7  
2014 12.7  
2015 9.0  
2016 $ 6.2