Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Nov. 30, 2011
Nov. 30, 2010
Income Taxes (Textual)        
Effective tax rate 37.40% 27.60% 24.60% 37.00%
Recognition of a valuation allowance against deferred tax assets in the U.K.       $ 30.1
Decrease in uncertain tax positions   $ 9.7 $ 60.2 $ 35.1