v2.4.0.6

Stockholders' Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Stockholders Equity (Textual) [Abstract] |  |  |  |
Maximum amount authorized to repurchase common stock by Board of Director | $ 400.0 | $ 750.0 |  |
Purchase of common stock, shares |  | 17.1 |  |
Amount used to repurchase of common stock |  | 500.8 |  |
Average cost per share of common stock |  | $ 29.21 |  |
Quarterly dividend per share |  | $ 0.22 |  |
Cash dividends declared |  | 314.1 | 298.8 | 288.7
Quarterly dividend payable |  | $ 81.4 | $ 76.7 |

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