Acquisitions and Divestitures - 2016 Narrative (Details) $ in Millions		3 Months Ended	12 Months Ended
	Jun. 23, 2016 USD ($)	Mar. 31, 2016 airport	Dec. 31, 2016 USD ($) acquisition	Dec. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 835.8	$ 845.5	$ 675.8
Previous percentage ownership of noncontrolling owners	49.00%		49.00%
Capital in excess of par value			$ 399.9	354.9
Land segment
Business Acquisition [Line Items]
Goodwill			496.7	518.5	430.7
Aviation segment
Business Acquisition [Line Items]
Goodwill			266.8	$ 326.9	$ 173.7
Aviation fueling operations of certain ExxonMobil affiliates
Business Acquisition [Line Items]
Number of airports to be acquired (more than) | airport		80
2016 Acquisitions
Business Acquisition [Line Items]
Goodwill			173.3
Goodwill anticipated to be deductible for tax purposes			133.4
Purchase price			446.9
2016 Acquisitions | Trademark/Trade name rights
Business Acquisition [Line Items]
Identifiable intangible assets			9.5
2016 Acquisitions | Customer relationships
Business Acquisition [Line Items]
Identifiable intangible assets			$ 105.1
Weighted average amortizable lives of identifiable intangible assets			5 years 7 months 6 days
2016 Acquisitions | Others
Business Acquisition [Line Items]
Identifiable intangible assets			$ 3.9
Weighted average amortizable lives of identifiable intangible assets			2 years 1 month 6 days
2016 Acquisitions | Land segment
Business Acquisition [Line Items]
Number of business acquired | acquisition			6
Goodwill			$ 77.7
2016 Acquisitions | Aviation segment
Business Acquisition [Line Items]
Goodwill			$ 95.6
Tobras
Business Acquisition [Line Items]
Purchase price	$ 3.7
Previous percentage of ownership of parent	51.00%
Capital in excess of par value	$ 10.9
Cash paid for acquisition of businesses	3.7
Initial noncontrolling interest upon acquisition of businesses	$ 7.2