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Business Segments - Balance Sheet Items (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, net | $ 2,688.8 | $ 2,739.6
Total assets: |  |
Total assets | 5,797.5 | 5,676.9
Aviation segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 1,074.7 | 992.2
Land segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 820.9 | 846.1
Marine segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 793.2 | 901.2
Operating Segments | Aviation segment |  |
Accounts receivable, net: |  |
Allowance for bad debt | 15.8 | 17.7
Total assets: |  |
Total assets | 2,416.4 | 2,261.0
Operating Segments | Land segment |  |
Accounts receivable, net: |  |
Allowance for bad debt | 3.1 | 2.7
Total assets: |  |
Total assets | 2,114.3 | 2,178.1
Operating Segments | Marine segment |  |
Accounts receivable, net: |  |
Allowance for bad debt | 18.4 | 19.0
Total assets: |  |
Total assets | 1,032.7 | 1,124.2
Corporate |  |
Total assets: |  |
Total assets | $ 234.1 | $ 113.6

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