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Business Segments - Income Statement Items (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue:
Revenue	$ 7,085.5	$ 3,158.3	$ 13,043.4	$ 11,173.5
Gross profit:
Gross profit	183.9	213.9	375.5	472.6
Income from operations:
Income from operations	30.9	11.9	68.6	82.7
Corporate overhead - unallocated
Income from operations:
Income from operations	(15.9)	(20.1)	(40.5)	(37.9)
Aviation segment
Revenue:
Revenue	2,805.8	1,020.6	4,900.8	4,784.8
Gross profit:
Gross profit	87.4	91.9	164.1	185.0
Aviation segment | Operating Segments
Income from operations:
Income from operations	34.0	9.0	57.0	38.1
Land segment
Revenue:
Revenue	2,457.2	1,197.6	4,645.4	3,303.6
Gross profit:
Gross profit	73.8	84.8	163.3	191.0
Land segment | Operating Segments
Income from operations:
Income from operations	8.1	9.7	40.9	35.3
Marine segment
Revenue:
Revenue	1,822.4	940.2	3,497.1	3,085.2
Gross profit:
Gross profit	22.7	37.2	48.2	96.6
Marine segment | Operating Segments
Income from operations:
Income from operations	$ 4.8	$ 13.3	$ 11.1	$ 47.2

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