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Earnings Per Share Basic and Diluted (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Mar. 31, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Net income available to IPG common stockholders - basic | $ 208.1 | $ 42.4 |  | $ 261.7 | $ 76.2 |
Net income available to IPG common stockholders - diluted | 212.4 | 43.7 |  | 265.8 | 55.5 |
Weighted-average number of common shares outstanding - basic | 464.7 | 474.7 |  | 471.3 | 473.0 |
Weighted-average number of common shares outstanding - diluted | 537.6 | 533.6 |  | 527.8 | 526.4 |
Earnings per share available to IPG common stockholders - basic | $ 0.45 | $ 0.09 |  | $ 0.56 | $ 0.16 |
Earnings per share available to IPG common stockholders - diluted | $ 0.40 | $ 0.08 |  | $ 0.50 | $ 0.11 |
Adjustments: Effect of dilutive securities |  |  |  |  |  |
Preferred stock dividends | 2.9 | 0 |  | 0 | 0 |
Benefit from preferred stock repurchased | 0 | 0 |  | 0 | (21.7) | [1]
Add: Effect of dilutive securities |  |  |  |  |  |
Restricted stock, stock options and other equity awards | 7.6 | 10.6 |  | 7.7 | 9.3 |
Preferred stock outstanding | 16.5 | 0 |  | 0 | 0 |
Preferred stock repurchased | 0 | 0 |  | 0 | 11.9 |
Dividends declared and associated with preferred stock repurchased |  |  | 4.0 |  |  |
4.25% Notes |  |  |  |  |  |
Adjustments: Effect of dilutive securities |  |  |  |  |  |
Interest on convertible debt | 0.4 | 0.3 |  | 1.0 | 1.0 |
Add: Effect of dilutive securities |  |  |  |  |  |
Convertible debt securities | 32.5 | 32.2 |  | 32.5 | 32.2 |
Stated Interest Rate | 4.25% |  |  | 4.25% |  |
4.75% Notes |  |  |  |  |  |
Adjustments: Effect of dilutive securities |  |  |  |  |  |
Interest on convertible debt | $ 1.0 | $ 1.0 |  | $ 3.1 | $ 0 |
Add: Effect of dilutive securities |  |  |  |  |  |
Convertible debt securities | 16.3 | 16.1 |  | 16.3 | 0 |
Stated Interest Rate | 4.75% |  |  | 4.75% |  |
[1] | For the nine months ended September 30, 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.

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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. + Details
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