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Business Segments - Balance Sheet Items (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, net | $ 2,951.9 | $ 2,705.6
Total assets: |  |
Total assets | 5,757.0 | 5,587.8
Aviation segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 1,149.7 | 1,013.0
Allowance for bad debt | 11.5 | 10.8
Land segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 882.4 | 874.7
Allowance for bad debt | 4.1 | 6.6
Marine segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 919.7 | 817.9
Allowance for bad debt | 9.8 | 10.4
Operating Segments | Aviation segment |  |
Total assets: |  |
Total assets | 2,326.8 | 2,240.4
Operating Segments | Land segment |  |
Total assets: |  |
Total assets | 2,107.2 | 2,091.4
Operating Segments | Marine segment |  |
Total assets: |  |
Total assets | 1,159.9 | 1,097.1
Corporate |  |
Total assets: |  |
Total assets | $ 163.1 | $ 158.9

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