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Business Segments, Geographic Information and Major Customers - Balance Sheet Items (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, net | $ 2,891.9 | $ 2,739.6
Total assets: |  |
Total assets | 5,992.4 | 5,676.9
Corporate |  |
Total assets: |  |
Total assets | 296.8 | 113.6
Aviation segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 1,098.2 | 992.2
Allowance for bad debt | 14.6 | 17.7
Aviation segment | Operating Segments |  |
Total assets: |  |
Total assets | 2,416.5 | 2,261.0
Land segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 863.2 | 846.1
Allowance for bad debt | 2.8 | 2.7
Land segment | Operating Segments |  |
Total assets: |  |
Total assets | 2,089.4 | 2,178.1
Marine segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 930.5 | 901.2
Allowance for bad debt | 18.0 | 19.0
Marine segment | Operating Segments |  |
Total assets: |  |
Total assets | $ 1,189.7 | $ 1,124.2

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