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Earnings Per Share Basic and Diluted (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net income available to IPG common stockholders - basic | $ 313.3 | $ 68.7 | [1] | $ 99.0 | $ (45.9) | $ 259.0 | $ 208.1 | $ 101.7 | $ (48.1) | $ 435.1 |  | $ 520.7 | $ 271.2 |
Preferred stock dividends |  |  |  |  |  |  |  |  |  | 11.6 |  | 11.6 | 0 |
Benefit from preferred stock repurchased |  |  |  |  |  |  |  |  |  | 0 |  | 0 | (21.7) | [2]
Net income available to IPG common stockholders - diluted |  |  |  |  |  |  |  |  |  | 451.1 |  | 537.8 | 254.9 |
Weighted-average number of common shares outstanding - basic |  |  |  |  |  |  |  |  |  | 432.5 |  | 465.5 | 473.6 |
Restricted stock, stock options and other equity awards |  |  |  |  |  |  |  |  |  | 7.2 |  | 9.1 | 11.3 |
Preferred stock outstanding |  |  |  |  |  |  |  |  |  | 16.9 |  | 16.5 | 0 |
Preferred stock repurchased |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 8.9 |
Weighted-average number of common shares outstanding - diluted |  |  |  |  |  |  |  |  |  | 481.4 |  | 540.6 | 542.1 |
Earnings per share available to IPG common stockholders - basic | $ 0.74 | $ 0.16 |  | $ 0.23 | $ (0.10) | $ 0.58 | $ 0.45 | $ 0.21 | $ (0.10) | $ 1.01 |  | $ 1.12 | $ 0.57 |
Earnings per share available to IPG common stockholders - diluted | $ 0.68 | $ 0.15 |  | $ 0.22 | $ (0.10) | $ 0.50 | $ 0.40 | $ 0.19 | $ (0.10) | $ 0.94 |  | $ 0.99 | $ 0.47 |
Dividends declared and associated with preferred stock repurchased |  |  |  |  |  |  |  |  |  |  |  |  | 4.0 |
4.25% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on convertible debt |  |  |  |  |  |  |  |  |  | 0.3 | [3] | 1.4 | 1.4 |
Convertible debt securities |  |  |  |  |  |  |  |  |  | 7.9 | [3] | 33.0 | 32.2 |
4.75% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on convertible debt |  |  |  |  |  |  |  |  |  | $ 4.1 |  | $ 4.1 | $ 4.0 |
Convertible debt securities |  |  |  |  |  |  |  |  |  | 16.9 |  | 16.5 | 16.1 |
[1] | The three months ended December 31, 2012 and the three months ended September 30, 2011, include a pre-tax gain of $93.6 and $132.2, respectively, related to the sale of our holdings in Facebook.
[2] | For the year ended December 31, 2010, the benefit from the preferred stock repurchased is excluded from net income available to IPG common stockholders for purposes of calculating diluted earnings per share since the associated common shares, if converted, were dilutive. In addition, the benefit is also net of $4.0 of preferred dividends that were declared during the first quarter of 2010 and associated with the preferred stock repurchased.
[3] | We retired all of our outstanding 4.25% Notes in March 2012. For purposes of calculating diluted earnings per share for 2012, the potentially dilutive shares are pro-rated based on the period they were outstanding.

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- Definition The excess of (1) the fair value of all securities and other consideration transferred in transactions by the registrant to the holders of the convertible preferred stock over (2) the adjusted carrying value, during the accounting period, which was added to earnings available to common shareholders in the calculation of earnings per share, net of preferred dividends declared prior to repurchase. + References No definition available. + Details
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