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Business Segments - Income Statement Items (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Information concerning revenue, gross profit and income from operations by segment
Number of reportable operating business segments | segment			3
Revenue:
Revenue	$ 9,459.4	$ 10,150.8	$ 18,138.2	$ 19,332.2
Gross profit:
Gross profit	268.6	246.2	519.7	489.6
Income from operations:
Income from operations	75.2	61.1	145.6	118.3
Operating Segments
Income from operations:
Income from operations	95.4	82.3	185.5	158.3
Corporate
Income from operations:
Income from operations	(20.2)	(21.2)	(40.0)	(40.0)
Aviation segment
Revenue:
Revenue	4,785.0	4,900.7	9,037.7	9,193.6
Gross profit:
Gross profit	140.5	127.4	254.8	237.3
Aviation segment | Operating Segments
Income from operations:
Income from operations	73.5	64.2	129.1	112.0
Land segment
Revenue:
Revenue	2,663.0	2,960.2	5,156.6	5,820.9
Gross profit:
Gross profit	91.7	88.6	193.2	190.8
Land segment | Operating Segments
Income from operations:
Income from operations	11.8	10.2	32.8	29.9
Marine segment
Revenue:
Revenue	2,011.4	2,289.9	3,943.9	4,317.7
Gross profit:
Gross profit	36.4	30.2	71.6	61.5
Marine segment | Operating Segments
Income from operations:
Income from operations	$ 10.1	$ 7.9	$ 23.6	$ 16.4

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