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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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net income available to IPG common stockholders - basic | $ 193.1 | $ 45.4 | [1] | $ 79.9 | $ (59.2) | $ 313.3 | [1] | $ 68.7 | $ 99.0 | $ (45.9) | $ 259.2 |  | $ 435.1 |  | $ 520.7
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  | 0 |  | 11.6 |  | 11.6
Net income available to IPG common stockholders - diluted |  |  |  |  |  |  |  |  |  |  | 260.0 |  | 451.1 |  | 537.8
Weighted-average number of common shares outstanding - basic |  |  |  |  |  |  |  |  |  |  | 421.1 |  | 432.5 |  | 465.5
Restricted stock, stock options and other equity awards |  |  |  |  |  |  |  |  |  |  | 5.2 |  | 7.2 |  | 9.1
Preferred stock outstanding 2 |  |  |  |  |  |  |  |  |  |  | 0 | [2] | 16.9 |  | 16.5
Weighted-average number of common shares outstanding - diluted |  |  |  |  |  |  |  |  |  |  | 429.6 |  | 481.4 |  | 540.6
Earnings per share available to IPG common stockholders - basic | $ 0.45 | $ 0.11 |  | $ 0.19 | $ (0.14) | $ 0.74 |  | $ 0.16 | $ 0.23 | $ (0.10) | $ 0.62 |  | $ 1.01 |  | $ 1.12
Earnings per share available to IPG common stockholders - diluted | $ 0.44 | $ 0.11 |  | $ 0.18 | $ (0.14) | $ 0.68 |  | $ 0.15 | $ 0.22 | $ (0.10) | $ 0.61 |  | $ 0.94 |  | $ 0.99
4.25% Convertible Senior Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on convertible debt |  |  |  |  |  |  |  |  |  |  | 0 | [3] | 0.3 | [3] | 1.4
Convertible debt securities |  |  |  |  |  |  |  |  |  |  | 0 | [3] | 7.9 | [3] | 33.0
4.75% Convertible Senior Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on convertible debt |  |  |  |  |  |  |  |  |  |  | $ 0.8 | [3] | $ 4.1 | [3] | $ 4.1
Convertible debt securities |  |  |  |  |  |  |  |  |  |  | 3.3 | [3] | 16.9 | [3] | 16.5
[1] | The three months ended September 30, 2013 include a pre-tax loss of $45.2, related to our early extinguishment of debt. The three months ended December 31, 2012 include a pre-tax gain of $93.6 related to the sale of our holdings in Facebook.
[2] | We converted all of our Series B Preferred Stock into common stock in October 2013. See Note 3 for further information. For purposes of calculating diluted earnings per share for 2013, the potentially dilutive shares would have been pro-rated based on the period they were outstanding but were antidilutive.
[3] | We retired all of our outstanding 4.75% Notes and 4.25% Notes in March 2013 and March 2012, respectively. See Note 2 for further information. For purposes of calculating diluted earnings per share for 2013 and 2012, the potentially dilutive shares are pro-rated based on the period they were outstanding.

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