Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

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Income Taxes (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2011
Feb. 28, 2010
Income Tax Disclosure [Abstract]        
Operating loss carryforwards $ 471.9      
Operating loss carryforwards subject to expiration 459.5      
Operating loss carryforwards, expiration dates 2018 through 2032      
Operating loss carryforwards not subject to expiration 12.4      
Tax benefits related to resolution of certain tax positions and expiration of statutes of limitations (2.7)      
Liability for income taxes associated with uncertain tax positions, excluding interest and penalties 100.6 92.0 154.4 124.0
Non-current unrecognized tax benefit liabilities, including interest and penalties 90.3 85.6    
Unrecognized tax benefit liabilities that would impact effective tax rate if recognized 100.6 92.0    
Income tax interest and penalties expense (income) 0.4 (3.7) (4.1)  
Income tax interest and penalties liability 8.3 7.9    
Estimate of change in unrecognized tax benefit liability reasonably possible as a result of examination or expiration of statutes of limitation, Minimum 2      
Estimate of change in unrecognized tax benefit liability reasonably possible as a result of examination or expiration of statutes of limitation, Maximum $ 20