Business Segments - Income Statement Items (Details) $ in Millions		3 Months Ended
		Mar. 31, 2017 USD ($) segment	Mar. 31, 2016 USD ($)
Information concerning revenue, gross profit and income from operations by segment
Number of reportable operating business segments | segment		3
Revenue:
Total revenue	[1]	$ 8,194.3	$ 5,190.8
Gross profit:
Gross profit	[1]	231.4	221.5
Income from operations:
Income from operations	[1]	50.3	61.0
Aviation segment
Revenue:
Total revenue		3,317.4	2,219.4
Gross profit:
Gross profit		100.0	88.7
Land segment
Revenue:
Total revenue		2,783.4	1,695.0
Gross profit:
Gross profit		97.8	93.6
Marine segment
Revenue:
Total revenue		2,093.5	1,276.5
Gross profit:
Gross profit		33.6	39.2
Operating Segments
Income from operations:
Income from operations		70.1	79.4
Operating Segments | Aviation segment
Income from operations:
Income from operations		40.4	34.0
Operating Segments | Land segment
Income from operations:
Income from operations		21.4	34.0
Operating Segments | Marine segment
Income from operations:
Income from operations		8.3	11.4
Corporate
Income from operations:
Income from operations		$ (19.8)	$ (18.4)

[1] Amounts may not add due to rounding