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Acquisitions - Narrative (Details) $ in Millions		3 Months Ended		6 Months Ended
	Jun. 23, 2016 USD ($)	Mar. 31, 2017 acquisition	Mar. 31, 2016 acquisition airport	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016
Acquisitions
Previous percentage ownership of noncontrolling owners	49.00%					49.00%
Capital in excess of par value				$ 373.3	$ 399.9
Acquisitions 2017
Acquisitions
Number of businesses acquired | acquisition		2
Goodwill anticipated to be deductible for tax purposes				22.4
Estimated purchase price				91.9
Acquisitions 2017 | Customer relationships
Acquisitions
Identifiable intangible assets				$ 40.1
Weighted average amortizable lives of identifiable intangible assets				6 years 10 months 24 days
Aviation fueling operations of certain ExxonMobil affiliates
Acquisitions
Number of airports to be acquired (more than) | airport			80
Tobras
Acquisitions
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
Acquisitions, 2016 | Land segment
Acquisitions
Number of businesses acquired | acquisition			3

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Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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