Quarterly report pursuant to Section 13 or 15(d)

Other Comprehensive (Loss)/Income (Details)

v2.4.0.6
Other Comprehensive (Loss)/Income (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Aug. 31, 2012
Aug. 31, 2011
May 31, 2012
Other comprehensive (loss)/income:      
Unrealized (losses)/gains on available-for-sale securities, net of tax $ (0.3) $ 6.7  
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income, net of tax (0.1)     
Total other comprehensive (loss)/income (0.4) 6.7  
Other Comprehensive (Loss)/Income (Textual) [Abstract]      
Accumulated other comprehensive income 37.3   37.7
Accumulated other comprehensive income, tax amount $ 21.5   $ 21.8