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Business Segments - Balance Sheet Items (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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Accounts receivable, net: |  |  |
Accounts receivable, net | [1] | $ 2,062.6 | $ 1,812.6
Total assets: |  |  |
Total assets | [1] | 5,152.5 | 4,525.3
Aviation Segment |  |  |
Accounts receivable, net: |  |  |
Accounts receivable, net |  | 590.7 | 571.6
Allowance for bad debt |  | 6.2 | 6.1
Land Segment |  |  |
Accounts receivable, net: |  |  |
Accounts receivable, net |  | 747.1 | 629.8
Allowance for bad debt |  | 7.4 | 7.2
Marine segment |  |  |
Accounts receivable, net: |  |  |
Accounts receivable, net |  | 724.8 | 611.2
Allowance for bad debt |  | 10.8 | 10.6
Operating Segments | Aviation Segment |  |  |
Total assets: |  |  |
Total assets |  | 1,812.7 | 1,546.9
Operating Segments | Land Segment |  |  |
Total assets: |  |  |
Total assets |  | 1,957.3 | 1,651.5
Operating Segments | Marine segment |  |  |
Total assets: |  |  |
Total assets |  | 1,237.8 | 1,149.5
Corporate |  |  |
Total assets: |  |  |
Total assets |  | $ 144.7 | $ 177.3
[1] | Amounts may not add due to rounding

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