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Business Segments - Income Statement Items (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($) segment | Mar. 31, 2018 USD ($)
Information concerning revenue, gross profit and income from operations by segment |  |
Number of reportable operating business segments | segment | 3 |
Revenue: |  |
Revenue | $ 8,678.8 | $ 9,181.3
Gross profit: |  |
Gross profit | 251.1 | 243.4
Income from operations: |  |
Income from operations | 70.4 | 57.2
Operating Segments |  |
Income from operations: |  |
Income from operations | 90.1 | 75.9
Corporate |  |
Income from operations: |  |
Income from operations | (19.7) | (18.7)
Aviation segment |  |
Revenue: |  |
Revenue | 4,252.7 | 4,292.9
Gross profit: |  |
Gross profit | 114.3 | 110.0
Aviation segment | Operating Segments |  |
Income from operations: |  |
Income from operations | 55.6 | 47.8
Land segment |  |
Revenue: |  |
Revenue | 2,493.6 | 2,860.7
Gross profit: |  |
Gross profit | 101.5 | 102.2
Land segment | Operating Segments |  |
Income from operations: |  |
Income from operations | 21.0 | 19.6
Marine segment |  |
Revenue: |  |
Revenue | 1,932.5 | 2,027.7
Gross profit: |  |
Gross profit | 35.2 | 31.2
Marine segment | Operating Segments |  |
Income from operations: |  |
Income from operations | $ 13.5 | $ 8.6

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