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Dividends (Details) (USD $) | 0 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jan. 24, 2013 | Mar. 31, 2013 | Mar. 31, 2013 IEP | Apr. 30, 2013 IEP
Dividends |  |  |  |
Initial quarterly dividend expected (in dollars per share) | $ 0.75 |  |  |
Dividend expected on annualized basis (in dollars per share) | $ 3.00 |  |  |
Special dividend payable (in dollars per share) | $ 5.50 |  |  |
Dividends |  |  |  |
Amount of the special dividend paid |  | $ 477,571,000 | $ 391,600,000 |
Ownership percentage held |  |  | 82.00% | 82.00%
Cash dividends paid to parent company |  |  | $ 391,600,000 |

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