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Business Segments, Geographic Information, and Major Customers - Income Statement Items (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Revenue:
Total revenue	$ 6,731.9	$ 7,810.7	$ 8,496.4	$ 7,340.7	$ 9,779.5	$ 11,713.4	$ 11,342.5	$ 10,550.9	$ 30,379.7	$ 43,386.4	$ 41,561.9
Gross profit:
Gross profit	$ 228.0	$ 226.7	$ 190.4	$ 215.4	$ 219.5	$ 214.6	$ 191.5	$ 188.0	860.5	813.6	752.8
Income from operations:
Income from operations									247.2	269.1	264.5
Depreciation and amortization:
Depreciation and amortization									63.4	59.4	44.7
Capital expenditures:
Total capital expenditures									48.4	51.8	82.7
Aviation Segment
Revenue:
Total revenue									11,738.2	17,268.8	16,087.6
Gross profit:
Gross profit									361.4	321.6	327.2
Marine segment
Revenue:
Total revenue									9,367.2	13,843.3	14,790.3
Gross profit:
Gross profit									189.6	205.6	177.1
Land Segment
Revenue:
Total revenue									9,274.3	12,274.3	10,684.0
Gross profit:
Gross profit									$ 309.5	286.4	248.5
Operating Segments
Information concerning revenue, gross profit and income from operations by segment
Number of reportable operating business segments | item									3
Income from operations:
Income from operations									$ 308.1	322.6	309.5
Operating Segments | Aviation Segment
Income from operations:
Income from operations									131.7	142.3	150.9
Depreciation and amortization:
Depreciation and amortization									22.5	15.4	15.9
Capital expenditures:
Total capital expenditures									13.4	9.0	5.8
Operating Segments | Marine segment
Income from operations:
Income from operations									73.0	90.0	73.8
Depreciation and amortization:
Depreciation and amortization									6.4	5.6	5.4
Capital expenditures:
Total capital expenditures									8.0	13.9	17.3
Operating Segments | Land Segment
Income from operations:
Income from operations									103.4	90.3	84.8
Depreciation and amortization:
Depreciation and amortization									30.8	34.7	20.8
Capital expenditures:
Total capital expenditures									16.4	16.0	54.3
Corporate
Income from operations:
Income from operations									60.9	53.5	45.0
Depreciation and amortization:
Depreciation and amortization									3.7	3.7	2.6
Capital expenditures:
Total capital expenditures									$ 10.6	$ 12.9	$ 5.3

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