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Common Stock Repurchases (Details) - USD ($) shares in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Aug. 31, 2014 | Aug. 31, 2015 | Aug. 31, 2014 | Sep. 30, 2015
Common Stock Repurchases [Abstract] |  |  |  |
Common stock repurchased and retired (in shares) | 0.7 | 1.3 | 2.3 |
Common stock repurchased and retired | $ 17,600,000 | $ 32,900,000 | $ 52,600,000 |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Authorized amount for share repurchase programs |  | 100,000,000 |  |
Remaining authorized repurchase amount |  | $ 14,500,000 |  |
Subsequent Event [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Authorized amount for share repurchase programs |  |  |  | $ 100,000,000.0
Remaining authorized repurchase amount |  |  |  | $ 114,500,000

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