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 9 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
May 31, 2012
Other comprehensive (Loss)/(Income):          
Unrealized (losses)/gains on available-for-sale securities, net of tax $ (6.6) $ 9.4 $ (4.4) $ 6.0  
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income, net of tax (0.4) (0.2) (0.6) (0.4)  
Total other comprehensive (loss)/income, net of tax (7.0) 9.2 (5.0) 5.6  
Other Comprehensive(Loss)/Income (Textual)          
Accumulated other comprehensive income 32.7   32.7   37.7
Accumulated other comprehensive income, tax amount $ 19.1   $ 19.1   $ 21.8