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Business Segments - Balance Sheet Items (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, net | $ 2,241.4 | $ 2,344.0
Total assets: |  |
Total assets | 5,286.0 | 5,412.6
Aviation segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 786.0 | 776.0
Allowance for bad debt | 6.9 | 6.6
Land segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 712.2 | 737.5
Allowance for bad debt | 9.2 | 8.2
Marine segment |  |
Accounts receivable, net: |  |
Accounts receivable, net | 743.3 | 830.5
Allowance for bad debt | 11.6 | 10.2
Operating Segments | Aviation segment |  |
Total assets: |  |
Total assets | 2,049.4 | 2,050.6
Operating Segments | Land segment |  |
Total assets: |  |
Total assets | 1,913.8 | 1,928.5
Operating Segments | Marine segment |  |
Total assets: |  |
Total assets | 1,169.7 | 1,287.7
Corporate |  |
Total assets: |  |
Total assets | $ 153.1 | $ 145.8

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