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Restructuring Charges (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring and Related Activities [Abstract]
Restructuring charges	$ 59,600,000	$ 59,600,000	$ 0	$ 0
Restructuring charges included in accrued expenses and other current liabilities	32,000,000.0	32,000,000.0
Restructuring Cost and Reserve [Line Items]
Business line exit costs	50,300,000
Employee and facility-related	9,400,000
Restructuring charges	59,600,000	59,600,000	$ 0	$ 0
Corporate
Restructuring and Related Activities [Abstract]
Restructuring charges	5,100,000
Restructuring Cost and Reserve [Line Items]
Business line exit costs	0
Employee and facility-related	5,100,000
Restructuring charges	5,100,000
Aviation segment | Operating Segments
Restructuring and Related Activities [Abstract]
Restructuring charges	900,000
Restructuring Cost and Reserve [Line Items]
Business line exit costs	0
Employee and facility-related	900,000
Restructuring charges	900,000
Land segment | Operating Segments
Restructuring and Related Activities [Abstract]
Restructuring charges	52,400,000	52,400,000
Restructuring Cost and Reserve [Line Items]
Business line exit costs	50,300,000
Employee and facility-related	2,100,000
Restructuring charges	52,400,000	52,400,000
Marine segment | Operating Segments
Restructuring and Related Activities [Abstract]
Restructuring charges	1,400,000	1,400,000
Restructuring Cost and Reserve [Line Items]
Business line exit costs	0
Employee and facility-related	1,400,000
Restructuring charges	1,400,000	$ 1,400,000
Write off of notes due
Restructuring and Related Activities [Abstract]
Restructuring charges	26,000,000.0
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 26,000,000.0

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(2))
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