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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, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Information concerning revenue, gross profit and income from operations by segment
Number of reportable operating business segments | segment									3
Revenue:
Revenue	$ 8,872.0	$ 8,543.0	$ 8,086.2	$ 8,194.3	$ 7,792.1	$ 7,399.8	$ 6,633.0	$ 5,190.8	$ 33,695.5	$ 27,015.8	$ 30,381.4
Gross profit:
Gross profit	229.9	$ 239.9	$ 231.0	$ 231.4	$ 222.3	$ 236.7	$ 218.5	$ 221.5	932.2	899.0	861.0
Income from operations:
Income from operations									45.6	188.9	245.7
Depreciation and amortization:
Depreciation and amortization									86.0	82.3	65.5
Capital expenditures:
Total capital expenditures									54.0	37.7	48.4
Impairment of intangible assets									7.9
Goodwill impairment and intangible asset impairment									80.2
Restructuring charges	59.6								59.6	0.0	0.0
Operating Segments
Income from operations:
Income from operations									127.2	261.5	306.5
Corporate
Income from operations:
Income from operations									(81.6)	(72.7)	(60.9)
Depreciation and amortization:
Depreciation and amortization									3.5	4.4	3.7
Capital expenditures:
Total capital expenditures									19.1	14.5	10.6
Restructuring charges	5.1
Aviation segment
Revenue:
Revenue									14,538.2	10,914.4	11,739.8
Gross profit:
Gross profit									440.5	401.0	361.9
Aviation segment | Operating Segments
Income from operations:
Income from operations									192.9	160.5	132.2
Depreciation and amortization:
Depreciation and amortization									26.8	24.2	22.6
Capital expenditures:
Total capital expenditures									12.3	4.9	13.4
Restructuring charges	0.9
Land segment
Revenue:
Revenue									10,958.0	8,918.8	9,274.3
Gross profit:
Gross profit									365.8	348.5	309.5
Land segment | Operating Segments
Income from operations:
Income from operations									(7.9)	70.8	101.4
Depreciation and amortization:
Depreciation and amortization									49.8	47.1	32.9
Capital expenditures:
Total capital expenditures									21.0	12.3	16.4
Impairment of intangible assets									12.8
Restructuring charges	52.4								52.4
Marine segment
Revenue:
Revenue									8,199.3	7,182.5	9,367.2
Gross profit:
Gross profit									126.0	149.5	189.6
Marine segment | Operating Segments
Income from operations:
Income from operations									(57.8)	30.2	73.0
Depreciation and amortization:
Depreciation and amortization									5.8	6.6	6.4
Capital expenditures:
Total capital expenditures									1.5	$ 6.1	$ 8.0
Goodwill impairment and intangible asset impairment									79.1
Restructuring charges	$ 1.4								$ 1.4

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