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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	May 14, 2018	Apr. 25, 2018	Mar. 31, 2018	Mar. 31, 2017
Subsequent Event [Line Items]
Dividends declared (in dollars per share)			$ 0.5	$ 0.5
Dividends declared			$ 43.4
Forecast
Subsequent Event [Line Items]
Proceeds from distribution	$ 49.6
IEP Energy LLC
Subsequent Event [Line Items]
Ownership percentage held by controlling stockholder			82.00%
Subsequent Event
Subsequent Event [Line Items]
Dividends declared (in dollars per share)		$ 0.50
Dividends declared		$ 43.4
Distributions declared (in dollars per share)		$ 0.51
Distributions declared		$ 75.3
Subsequent Event | IEP Energy LLC | IEP Energy LLC
Subsequent Event [Line Items]
Dividends declared	$ 35.6
Ownership percentage held by controlling stockholder	82.00%

X

- Definition

Represents the percentage of ownership interest held by the majority shareholder

+ References

No definition available.

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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)
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- Definition

Amount of equity impact of cash distribution declared to unit-holder of limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

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- Definition

Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
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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
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

Cash inflow received as distributions, returns of capital, or sale proceeds from partnership interests held for investment purposes.

+ References

No definition available.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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