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Stockholders' Equity (Narrative) (Details)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Stockholders' Equity Note [Abstract]        
Maximum noncontrolling interest percentage in subsidiaries 100.00% 100.00% 100.00% 100.00%
Maximum number of shares to repurchase 20.0   20.0  
Repurchases of common stock 0 0 0 0
Common stock that can be repurchased in the future 6.2   6.2  
Shares Paid for Tax Withholding for Share Based Compensation   0 0.5 0.3