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Earnings Per Share - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 04, 2015 | Oct. 09, 2015 | Aug. 31, 2015 | Aug. 31, 2014 | Sep. 30, 2015 | Jan. 13, 2015
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |
Basic and diluted (loss) earnings per share from discontinued operations (dollars per share) |  |  | $ (0.05) | $ 0.04 |  |
Options granted and excluded from the computation of diluted earnings per share (shares) |  |  | 0.5 | 0.6 |  |
Common stock purchased under share buyback | 1.4 |  | 2.4 |  |  |
Common stock purchased under a share buyback, average price per share |  |  | $ 85.65 |  |  |
Aggregate purchase price of common stock under a share buyback program | $ 120,000,000 |  | $ 202,500,000 |  |  |
Employee payroll taxes due on restricted stock |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |
Common stock purchased under share buyback |  |  | 0.2 |  |  |
Common stock purchased under a share buyback, average price per share |  |  | $ 85.54 |  |  |
Aggregate purchase price of common stock under a share buyback program |  |  | $ 19,100,000 |  |  |
January 13, 2015 |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  |  | $ 500,000,000.0
August 4, 2015 |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |
Share buyback program, authorized amount | $ 500,000,000.0 |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |
Common stock purchased under share buyback |  | 2.1 |  |  | 5.9 |
Common stock purchased under a share buyback, average price per share |  |  |  |  | $ 84.07 |
Aggregate purchase price of common stock under a share buyback program |  | $ 180,400,000 |  |  | $ 500,000,000 |

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