Business Segments - Income Statement Items (Details) $ in Millions		3 Months Ended
		Mar. 31, 2016 USD ($) segment	Mar. 31, 2015 USD ($)
Information concerning revenue, gross profit and income from operations by segment
Number of reportable operating business segments | segment		3
Revenue:
Total revenue	[1]	$ 5,192.6	$ 7,340.7
Gross profit:
Gross profit	[1]	223.8	215.4
Income from operations:
Income from operations	[1]	63.3	71.5
Aviation Segment
Revenue:
Total revenue	[2]	2,221.1	2,897.0
Gross profit:
Gross profit	[2]	91.0	82.9
Land Segment
Revenue:
Total revenue	[2]	1,695.0	2,123.0
Gross profit:
Gross profit	[2]	93.6	78.6
Marine segment
Revenue:
Total revenue	[2]	1,276.5	2,320.7
Gross profit:
Gross profit	[2]	39.2	53.9
Operating Segments
Income from operations:
Income from operations	[2]	81.7	85.7
Operating Segments | Aviation Segment
Income from operations:
Income from operations	[2]	36.3	27.8
Operating Segments | Land Segment
Income from operations:
Income from operations	[2]	34.0	31.8
Operating Segments | Marine segment
Income from operations:
Income from operations	[2]	11.4	26.1
Corporate
Income from operations:
Income from operations	[2]	$ (18.4)	$ (14.2)

[1] Amounts may not add due to rounding

[2] Amounts may not add due to rounding