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Business Segments - Income Statement Items (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) segment | Jun. 30, 2018 USD ($)
Information concerning revenue, gross profit and income from operations by segment |  |  |  |
Number of reportable operating business segments | segment |  |  | 3 |
Revenue: |  |  |  |
Revenue | $ 9,459.4 | $ 10,150.8 | $ 18,138.2 | $ 19,332.2
Gross profit: |  |  |  |
Gross profit | 268.6 | 246.2 | 519.7 | 489.6
Income from operations: |  |  |  |
Income from operations | 75.2 | 61.1 | 145.6 | 118.3
Operating Segments |  |  |  |
Income from operations: |  |  |  |
Income from operations | 95.4 | 82.3 | 185.5 | 158.3
Corporate |  |  |  |
Income from operations: |  |  |  |
Income from operations | (20.2) | (21.2) | (40.0) | (40.0)
Aviation segment |  |  |  |
Revenue: |  |  |  |
Revenue | 4,785.0 | 4,900.7 | 9,037.7 | 9,193.6
Gross profit: |  |  |  |
Gross profit | 140.5 | 127.4 | 254.8 | 237.3
Aviation segment | Operating Segments |  |  |  |
Income from operations: |  |  |  |
Income from operations | 73.5 | 64.2 | 129.1 | 112.0
Land segment |  |  |  |
Revenue: |  |  |  |
Revenue | 2,663.0 | 2,960.2 | 5,156.6 | 5,820.9
Gross profit: |  |  |  |
Gross profit | 91.7 | 88.6 | 193.2 | 190.8
Land segment | Operating Segments |  |  |  |
Income from operations: |  |  |  |
Income from operations | 11.8 | 10.2 | 32.8 | 29.9
Marine segment |  |  |  |
Revenue: |  |  |  |
Revenue | 2,011.4 | 2,289.9 | 3,943.9 | 4,317.7
Gross profit: |  |  |  |
Gross profit | 36.4 | 30.2 | 71.6 | 61.5
Marine segment | Operating Segments |  |  |  |
Income from operations: |  |  |  |
Income from operations | $ 10.1 | $ 7.9 | $ 23.6 | $ 16.4

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