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Business Segments - Income Statement Items (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)
Information concerning revenue, gross profit and income from operations by segment
Number of reportable operating business segments | segment			3
Revenue:
Revenue	$ 9,322.7	$ 10,429.5	$ 27,460.9	$ 29,761.7
Gross profit:
Gross profit	305.7	266.7	825.3	756.3
Income from operations:
Income from operations	93.6	78.2	239.2	196.4
Operating Segments
Income from operations:
Income from operations	120.3	98.6	305.9	256.9
Corporate
Income from operations:
Income from operations	(26.7)	(20.5)	(66.7)	(60.4)
Aviation segment
Revenue:
Revenue	4,743.0	5,025.3	13,780.8	14,218.9
Gross profit:
Gross profit	156.9	140.7	411.7	378.0
Aviation segment | Operating Segments
Income from operations:
Income from operations	86.3	76.4	215.4	188.3
Land segment
Revenue:
Revenue	2,555.8	2,854.4	7,712.4	8,675.3
Gross profit:
Gross profit	95.4	83.0	288.6	273.8
Land segment | Operating Segments
Income from operations:
Income from operations	13.4	7.8	46.2	37.7
Marine segment
Revenue:
Revenue	2,023.9	2,549.8	5,967.7	6,867.5
Gross profit:
Gross profit	53.4	43.0	125.0	104.5
Marine segment | Operating Segments
Income from operations:
Income from operations	$ 20.6	$ 14.4	$ 44.2	$ 30.9

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