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Business Segments - Income Statement Items (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)
Information concerning revenue, gross profit and income from operations by segment
Number of reportable operating business segments | segment			3
Revenue:
Revenue	$ 3,158.3	$ 9,459.4	$ 11,173.5	$ 18,138.2
Gross profit:
Gross profit	213.9	268.6	472.6	519.7
Income from operations:
Income from operations	11.9	75.2	82.7	145.6
Operating Segments
Income from operations:
Income from operations	32.0	95.4	120.6	185.5
Corporate
Income from operations:
Income from operations	(20.1)	(20.2)	(37.9)	(40.0)
Aviation segment
Revenue:
Revenue	1,020.6	4,785.0	4,784.8	9,037.7
Gross profit:
Gross profit	91.9	140.5	185.0	254.8
Aviation segment | Operating Segments
Income from operations:
Income from operations	9.0	73.5	38.1	129.1
Land
Revenue:
Revenue	1,197.6	2,663.0	3,303.6	5,156.6
Gross profit:
Gross profit	84.8	91.7	191.0	193.2
Land | Operating Segments
Income from operations:
Income from operations	9.7	11.8	35.3	32.8
Marine segment
Revenue:
Revenue	940.2	2,011.4	3,085.2	3,943.9
Gross profit:
Gross profit	37.2	36.4	96.6	71.6
Marine segment | Operating Segments
Income from operations:
Income from operations	$ 13.3	$ 10.1	$ 47.2	$ 23.6

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