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Dividends (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule Of Dividends Paid Table [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Per common share (in dollars per share) | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 |  | $ 2 | $ 2 | $ 2
Total dividends paid |  |  |  |  |  |  |  |  |  | $ 173.7 | $ 173.6 | $ 173.7
Total dividends paid per common share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 2 | $ 2 |
Amount paid to IEP |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Dividends Paid Table [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total dividends paid |  |  |  |  |  |  |  |  |  | $ 142.4 | $ 142.4 |
Amounts paid to public stockholders |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Dividends Paid Table [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total dividends paid |  |  |  |  |  |  |  |  |  | $ 31.3 | $ 31.2 |
Quarterly |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Dividends Paid Table [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total amount paid |  | $ 43.4 | $ 43.4 | $ 43.4 | $ 43.4 | $ 43.4 | $ 43.4 | $ 43.4 | $ 43.4 |  |  |
Per common share (in dollars per share) |  | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.50 |  |  |
Shares outstanding (in shares) |  | 86.8 | 86.8 | 86.8 | 86.8 | 86.8 | 86.8 | 86.8 | 86.8 |  | 86.8 | 86.8
Quarterly | Amount paid to IEP |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Dividends Paid Table [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total amount paid |  | $ 35.6 | $ 35.6 | $ 35.6 | $ 35.6 | $ 35.6 | $ 35.6 | $ 35.6 | $ 35.6 |  |  |
Quarterly | Amounts paid to public stockholders |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Dividends Paid Table [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total amount paid |  | $ 7.8 | $ 7.8 | $ 7.8 | $ 7.8 | $ 7.8 | $ 7.8 | $ 7.8 | $ 7.8 |  |  |

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