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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 05, 2018 | Feb. 21, 2018 | 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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Dividend |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share (in dollars per share) |  |  | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 2 | $ 2 | $ 2
Aggregate dividends declared |  |  |  |  |  |  |  |  |  |  | $ 173.7 | $ 173.6 | $ 173.7
IEP |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage held by controlling stockholder |  |  |  |  |  |  |  |  |  |  | 82.00% |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share (in dollars per share) |  | $ 0.50 |  |  |  |  |  |  |  |  |  |  |
Aggregate dividends declared |  | $ 43.4 |  |  |  |  |  |  |  |  |  |  |
Subsequent event | IEP |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate dividends declared | $ 35.6 |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage held by controlling stockholder | 82.00% |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the percentage of ownership interest held by the majority shareholder + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Details
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