Annual report pursuant to Section 13 and 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
12 Months Ended
May 31, 2012
May 31, 2011
Components of intangible assets, at cost    
Client lists $ 223.6 $ 223.4
Other intangible assets 2.0 2.0
Total intangible assets, gross 225.6 225.4
Less: Accumulated amortization 169.8 148.2
Intangible assets, net of accumulated amortization 55.8 77.2
Estimated future amortization expense relating to intangible asset balances    
2013 18.1  
2014 13.0  
2015 9.2  
2016 6.4  
2017 $ 4.4