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
Aug. 31, 2012
May 31, 2012
Components of intangible assets, at cost    
Client lists $ 223.5 $ 223.6
Other intangible assets 2.0 2.0
Total intangible assets, gross 225.5 225.6
Less: Accumulated amortization 174.2 169.8
Intangible assets, net of accumulated amortization 51.3 55.8
Estimated future amortization expense relating to intangible asset balances    
2013 18.1  
2014 13.1  
2015 9.3  
2016 6.4  
2017 $ 4.4