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Business Segments, Geographic Information, and Major Customers - Income Statement Items (Details) $ in Millions | 3 Months Ended | 12 Months Ended
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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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