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Convertible Preferred Stock | 12 Months Ended
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Dec. 31, 2012
Features of Convertible Preferred Stock [Abstract] |
Preferred Stock | Convertible Preferred Stock Each share of our 5 1/4% Series B Cumulative Convertible Perpetual Preferred Stock (the “Series B Preferred Stock”) has a liquidation preference of $1,000 per share and is convertible at the option of the holder at any time into shares of our common stock, subject to adjustment upon the occurrence of certain events, including the payment of cash dividends on our common stock. The Series B Preferred Stock may be converted at our option if the closing price of our common stock multiplied by the conversion rate in effect at that time equals or exceeds 130% of the liquidation preference for 20 trading days during any consecutive 30 trading day period. Holders of the Series B Preferred Stock will be entitled to an adjustment to the conversion rate if they convert their shares in connection with a fundamental change satisfying certain specified conditions. The Series B Preferred Stock is junior to all of our existing and future debt obligations and senior to our common stock with respect to payments of dividends and rights upon liquidation, winding up or dissolution, to the extent of the liquidation preference. The number of shares outstanding, conversion rates and corresponding conversion prices and conversion shares for our Series B Preferred Stock are listed below.
| December 31,
| 2012 |  | 2011 |  | 2010
Shares outstanding (actual number) | 221,474 |  |  | 221,474 |  |  | 221,474 |
Conversion rate per share | 76.2197 |  |  | 74.4500 |  |  | 73.1904 |
Conversion price | $ | 13.12 |  |  | $ | 13.43 |  |  | $ | 13.66 |
Conversion shares | 16.9 |  |  | 16.5 |  |  | 16.2 |
During 2012 and 2011, the conversion rate per share for our Series B Preferred Stock was adjusted as a result of the cumulative effect of certain cash dividends declared and paid on our common stock during the year, which resulted in a corresponding adjustment of the conversion price and conversion shares. In 2010, we launched a tender offer and purchased 303,526 shares (actual number) of our Series B Preferred Stock for cash for an aggregate purchase price of $267.6. The aggregate purchase price was calculated as the number of shares tendered multiplied by the purchase price of $869.86 per share plus unpaid dividends of $1.9, which were prorated for the period the tendered shares were outstanding, and transaction costs directly associated with the repurchase. The carrying value of the tendered shares was $293.3 and was determined based on the number of shares tendered multiplied by the liquidation preference, less the pro-rata amount of issuance costs associated with the original issuance of the preferred stock. A benefit of $25.7, representing the excess carrying value of the tendered shares over consideration from the repurchase, was recorded as an adjustment to additional paid-in capital. Additionally, the pro-rata amount of issuance costs of $10.2 was recorded as an adjustment to additional paid-in capital. The terms of our Series B Preferred Stock do not permit us to pay dividends on our common stock unless all accumulated and unpaid dividends on the Series B Preferred Stock have been or contemporaneously are declared and paid, or provision for the payment thereof has been made. We declared annual dividends of $52.50 per share, or $11.6, $11.6 and $15.6, on our Series B Preferred Stock during 2012, 2011 and 2010, respectively. Regular quarterly dividends, if declared, are $13.125 per share. Dividends on each share of Series B Preferred Stock are payable quarterly in cash or, if certain conditions are met, in common stock, at our option on January 15, April 15, July 15 and October 15, or the next business date if these dates fall on the weekend or a holiday, of each year. Dividends on our Series B Preferred Stock are cumulative from the date of issuance and are payable on each payment date to the extent that we have assets that are legally available to pay dividends and our Board of Directors, or an authorized committee of our Board, declares a dividend payable. The terms of the Series B Preferred Stock include an embedded derivative instrument, the fair value of which as of December 31, 2012 and 2011 was negligible. The Series B Preferred Stock is not considered a security with participation rights in earnings available to IPG common stockholders due to the contingent nature of the conversion feature of these securities.

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