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 | ||