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Business Segments - Income Statement Items (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($)
Information concerning revenue, gross profit and income from operations by segment |  |
Number of reportable operating business segments | segment | 3 |
Revenue: |  |
Total revenue | $ 9,181.3 | $ 8,194.3
Gross profit: |  |
Gross profit | 243.4 | 231.4
Income from operations: |  |
Income from operations | 57.2 | 50.3
Aviation segment |  |
Revenue: |  |
Total revenue | 4,292.9 | 3,317.4
Gross profit: |  |
Gross profit | 110.0 | 100.0
Land segment |  |
Revenue: |  |
Total revenue | 2,860.7 | 2,783.4
Gross profit: |  |
Gross profit | 102.2 | 97.8
Marine segment |  |
Revenue: |  |
Total revenue | 2,027.7 | 2,093.5
Gross profit: |  |
Gross profit | 31.2 | 33.6
Operating Segments |  |
Income from operations: |  |
Income from operations | 75.9 | 70.1
Operating Segments | Aviation segment |  |
Income from operations: |  |
Income from operations | 47.8 | 40.4
Operating Segments | Land segment |  |
Income from operations: |  |
Income from operations | 19.6 | 21.4
Operating Segments | Marine segment |  |
Income from operations: |  |
Income from operations | 8.6 | 8.3
Corporate |  |
Income from operations: |  |
Income from operations | $ (18.7) | $ (19.8)

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