Annual report pursuant to Section 13 and 15(d)

Other Comprehensive (Loss) Income (Details)

 v2.3.0.11
Other Comprehensive (Loss) Income (Details) (USD $)
In Millions
12 Months Ended
May 31, 2011
May 31, 2010
May 31, 2009
Other Comprehensive Income      
Unrealized holding (losses)/gains $ (6.0) $ 3.1 $ 43.0
Income tax benefit/(expense) related to unrealized holding (losses)/gains 1.9 (0.6) (16.4)
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income (1.3) (3.2) (1.1)
Income tax expense on reclassification adjustment for the net gain on sale of available-for sale securities 0.5 1.2 0.4
Other comprehensive (loss)/income (4.9) 0.5 25.9
Other comprehensive (loss) income (Textuals) [Abstract]      
Accumulated other comprehensive income 37.5 42.4  
Accumulated other comprehensive income, tax amount $ 21.7 $ 24.1