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Business Segments, Geographic Information and Major Customers - Balance Sheet Items (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, net of allowance for credit losses of $53.8 million and $35.5 million as of December 31, 2020 and 2019, respectively | $ 1,238.4 | $ 2,891.9
Accounts receivable, allowance for credit losses | 53.8 | 35.5
Total assets: |  |
Total assets | 4,500.3 | 5,992.4
Corporate |  |
Total assets: |  |
Total assets | 583.7 | 296.8
Aviation segment |  |
Accounts receivable, net: |  |
Accounts receivable, net of allowance for credit losses of $53.8 million and $35.5 million as of December 31, 2020 and 2019, respectively | 464.7 | 1,098.2
Accounts receivable, allowance for credit losses | 41.2 | 14.6
Aviation segment | Operating Segments |  |
Total assets: |  |
Total assets | 1,789.5 | 2,416.5
Land segment |  |
Accounts receivable, net: |  |
Accounts receivable, net of allowance for credit losses of $53.8 million and $35.5 million as of December 31, 2020 and 2019, respectively | 394.5 | 863.2
Accounts receivable, allowance for credit losses | 5.0 | 2.8
Land segment | Operating Segments |  |
Total assets: |  |
Total assets | 1,459.5 | 2,089.4
Marine segment |  |
Accounts receivable, net: |  |
Accounts receivable, net of allowance for credit losses of $53.8 million and $35.5 million as of December 31, 2020 and 2019, respectively | 379.2 | 930.5
Accounts receivable, allowance for credit losses | 7.6 | 18.0
Marine segment | Operating Segments |  |
Total assets: |  |
Total assets | $ 667.6 | $ 1,189.7

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