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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

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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

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