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Acquisitions and Divestitures - 2016 Narrative (Details) $ in Millions		3 Months Ended		12 Months Ended		18 Months Ended
	Jun. 23, 2016 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2016 airport	Dec. 31, 2016 USD ($) acquisition	Dec. 31, 2014 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 835.8		$ 835.8	$ 653.3		$ 675.8
Previous percentage ownership of noncontrolling owners	49.00%	49.00%		49.00%
Capital in excess of par value		$ 399.9		$ 399.9			435.3
Increase in noncontrolling interest equity					19.4
Crude Oil Joint Venture Partner
Business Acquisition [Line Items]
Write off of outstanding amounts owed by former joint venture partner		7.5
Land segment
Business Acquisition [Line Items]
Goodwill		496.7		496.7	$ 405.9		$ 430.7
Aviation fueling operations of certain ExxonMobil affiliates
Business Acquisition [Line Items]
Number of airports to be acquired (more than) | airport			80
Aviation fueling operations of certain ExxonMobil affiliates | Forecast
Business Acquisition [Line Items]
Estimated purchase price						$ 260.0
2016 Acquisitions
Business Acquisition [Line Items]
Estimated purchase price				446.9
Goodwill		173.3		173.3
Goodwill anticipated to be deductible for tax purposes		133.4		133.4
2016 Acquisitions | Trademark/Trade name rights
Business Acquisition [Line Items]
Identifiable intangible assets		9.5		9.5
2016 Acquisitions | Customer relationships
Business Acquisition [Line Items]
Identifiable intangible assets		105.1		$ 105.1
Weighted average amortizable lives of identifiable intangible assets				5 years 7 months 8 days
2016 Acquisitions | Other
Business Acquisition [Line Items]
Identifiable intangible assets		$ 3.9		$ 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
Tobras
Business Acquisition [Line Items]
Estimated 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
Increase in noncontrolling interest equity	$ 7.2

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