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Common Stock Repurchases (Details) - USD ($)
shares in Millions
 3 Months Ended 6 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2015
May. 31, 2014
Common Stock Repurchases [Abstract]        
Common stock repurchased and retired (in shares) 1.0 1.2 1.3 1.6
Common stock repurchased and retired $ 25,000,000 $ 25,200,000 $ 32,900,000 $ 35,000,000
Authorized amount for share repurchase programs 100,000,000   100,000,000  
Remaining authorized repurchase amount $ 14,500,000   $ 14,500,000