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Business Segments, Geographic Information, and Major Customers - Balance Sheet Items (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, net | $ 2,705.6 | $ 2,344.0
Total assets: |  |
Total assets | 5,587.8 | 5,412.6
Corporate |  |
Total assets: |  |
Total assets | 158.9 | 145.8
Aviation segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 1,013.0 | 776.0
Allowance for bad debt | 10.8 | 6.6
Aviation segment | Operating Segments |  |
Total assets: |  |
Total assets | 2,240.4 | 2,050.6
Land segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 874.7 | 737.5
Allowance for bad debt | 6.6 | 8.2
Land segment | Operating Segments |  |
Total assets: |  |
Total assets | 2,091.4 | 1,928.5
Marine segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 817.9 | 830.5
Allowance for bad debt | 10.4 | 10.2
Marine segment | Operating Segments |  |
Total assets: |  |
Total assets | $ 1,097.1 | $ 1,287.7

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