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Business Segments - Income Statement Items (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)
Information concerning revenue, gross profit and income from operations by segment
Number of reportable operating business segments | segment			3
Revenue:
Revenue	$ 4,482.7	$ 9,322.7	$ 15,656.2	$ 27,460.9
Gross profit:
Gross profit	214.0	305.7	686.6	825.3
Income from operations:
Income from operations	38.8	93.6	121.5	239.2
Operating Segments
Income from operations:
Income from operations	56.2	120.3	176.8	305.9
Corporate
Income from operations:
Income from operations	(17.4)	(26.7)	(55.3)	(66.7)
Aviation segment
Revenue:
Revenue	1,596.2	4,743.0	6,381.0	13,780.8
Gross profit:
Gross profit	97.6	156.9	282.6	411.7
Aviation segment | Operating Segments
Income from operations:
Income from operations	29.2	86.3	67.3	215.4
Land
Revenue:
Revenue	1,645.2	2,555.8	4,948.8	7,712.4
Gross profit:
Gross profit	84.3	95.4	275.4	288.6
Land | Operating Segments
Income from operations:
Income from operations	18.8	13.4	54.1	46.2
Marine segment
Revenue:
Revenue	1,241.2	2,023.9	4,326.4	5,967.7
Gross profit:
Gross profit	32.0	53.4	128.6	125.0
Marine segment | Operating Segments
Income from operations:
Income from operations	$ 8.2	$ 20.6	$ 55.4	$ 44.2

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