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Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Balance as of December 31, 2017			$ 32.0
Severance and other restructuring-related costs	$ 17.1	$ 59.6		$ 59.6	$ 0.0
Paid during the period	(28.5)
Restructuring charges as of December 31, 2018	20.7	32.0	20.7	32.0
Corporate
Restructuring Cost and Reserve [Line Items]
Balance as of December 31, 2017			5.0
Severance and other restructuring-related costs	4.5
Paid during the period	(5.5)
Restructuring charges as of December 31, 2018	4.0	5.0	4.0	5.0
Aviation segment | Operating Segments
Restructuring Cost and Reserve [Line Items]
Balance as of December 31, 2017			0.7
Severance and other restructuring-related costs	1.6
Paid during the period	(0.8)
Restructuring charges as of December 31, 2018	1.4	0.7	1.4	0.7
Land segment
Restructuring Cost and Reserve [Line Items]
Severance and other restructuring-related costs			17.1	52.4
Land segment | Operating Segments
Restructuring Cost and Reserve [Line Items]
Balance as of December 31, 2017			25.0
Severance and other restructuring-related costs	6.5
Paid during the period	(18.9)
Restructuring charges as of December 31, 2018	12.6	25.0	12.6	25.0
Marine segment
Restructuring Cost and Reserve [Line Items]
Severance and other restructuring-related costs				1.4
Marine segment | Operating Segments
Restructuring Cost and Reserve [Line Items]
Balance as of December 31, 2017			1.3
Severance and other restructuring-related costs	4.5
Paid during the period	(3.3)
Restructuring charges as of December 31, 2018	$ 2.6	$ 1.3	$ 2.6	$ 1.3

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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