Annual report pursuant to Section 13 and 15(d)

Other Comprehensive (Loss)/Income (Details)

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Other Comprehensive (Loss)/Income (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Other Comprehensive (Loss)/(Income):      
Unrealized holding (losses)/gains $ (24.1) $ 1.3 $ (6.0)
Income tax benefit/(expense) related to unrealized holding (losses)/gains 9.0 (0.4) 1.9
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income (0.9) (1.0) (1.3)
Income tax expense on reclassification adjustment for the net gain on sale of available-for-sale securities 0.3 0.3 0.5
Other comprehensive (loss)/income (15.7) 0.2 (4.9)
Other Comprehensive (Loss)/Income (Textual)      
Accumulated other comprehensive income 22.0 37.7  
Accumulated other comprehensive income, tax amount $ 12.5 $ 21.8