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Business Segments - Balance Sheet Items (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, net | $ 2,666.3 | $ 2,705.6
Total assets: |  |
Total assets | 5,472.1 | 5,587.8
Aviation segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 991.1 | 1,013.0
Allowance for bad debt | 11.1 | 10.8
Land segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 912.4 | 874.7
Allowance for bad debt | 4.1 | 6.6
Marine segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 762.7 | 817.9
Allowance for bad debt | 9.4 | 10.4
Operating Segments | Aviation segment |  |
Total assets: |  |
Total assets | 2,160.2 | 2,240.4
Operating Segments | Land segment |  |
Total assets: |  |
Total assets | 2,144.3 | 2,091.4
Operating Segments | Marine segment |  |
Total assets: |  |
Total assets | 986.5 | 1,097.1
Corporate |  |
Total assets: |  |
Total assets | $ 181.0 | $ 158.9

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