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Acquisitions and Divestitures - 2017 Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) acquisition	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 845.5	$ 835.8	$ 675.8
Aviation segment
Business Acquisition [Line Items]
Goodwill	326.9	266.8	173.7
Land segment
Business Acquisition [Line Items]
Goodwill	$ 518.5	$ 496.7	$ 430.7
Acquisitions 2017
Business Acquisition [Line Items]
Number of business acquired | acquisition	5
Goodwill	$ 63.5
Goodwill anticipated to be deductible for tax purposes	29.5
Acquisitions 2017 | Customer relationships
Business Acquisition [Line Items]
Identifiable intangible assets	$ 41.7
Weighted average amortizable lives of identifiable intangible assets	8 years
Acquisitions 2017 | Aviation segment
Business Acquisition [Line Items]
Goodwill	$ 51.3
Acquisitions 2017 | Land segment
Business Acquisition [Line Items]
Goodwill	$ 12.2

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 805
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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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