Annual report pursuant to Section 13 and 15(d)

Other Comprehensive Income/(Loss) (Details)

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Other Comprehensive Income/(Loss) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2012
May 31, 2011
May 31, 2010
Components of other comprehensive income/(loss)      
Unrealized holding gains/(losses) $ 1.3 $ (6.0) $ 3.1
Income tax (expense)/benefit related to unrealized holding gains/(losses) (0.4) 1.9 (0.6)
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income (1.0) (1.3) (3.2)
Income tax expense on reclassification adjustment for the net gain on sale of available-for-sale securities 0.3 0.5 1.2
Other comprehensive income/(loss) 0.2 (4.9) 0.5
Other Comprehensive Income/(Loss) (Textual) [Abstract]      
Accumulated other comprehensive income 37.7 37.5  
Accumulated other comprehensive income, tax amount $ 21.8 $ 21.7