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Business Segments, Geographic Information, and Major Customers - Balance Sheet Items (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Accounts receivable, net: |  |  |
Accounts receivable, net | $ 2,344.0 | $ 1,812.6 |
Goodwill: |  |  |
Goodwill | 835.8 | 675.8 | $ 653.3
Identifiable intangible assets, net: |  |  |
Identifiable intangible assets, net | 282.3 | 210.9 |
Total assets: |  |  |
Total assets | 5,412.6 | 4,525.3 |
Aviation segment |  |  |
Accounts receivable, net: |  |  |
Accounts receivable, net | 776.0 | 571.6 |
Allowance for bad debt | 6.6 | 6.1 |
Goodwill: |  |  |
Goodwill | 266.8 | 173.7 | 174.3
Identifiable intangible assets, net: |  |  |
Identifiable intangible assets, net | 72.1 | 64.7 |
Marine segment |  |  |
Accounts receivable, net: |  |  |
Accounts receivable, net | 830.5 | 611.2 |
Allowance for bad debt | 10.2 | 10.7 |
Goodwill: |  |  |
Goodwill | 72.3 | 71.4 | 73.1
Identifiable intangible assets, net: |  |  |
Identifiable intangible assets, net | 5.0 | 6.1 |
Land segment |  |  |
Accounts receivable, net: |  |  |
Accounts receivable, net | 737.5 | 629.8 |
Allowance for bad debt | 8.2 | 8.2 |
Goodwill: |  |  |
Goodwill | 496.7 | 430.7 | $ 405.9
Identifiable intangible assets, net: |  |  |
Identifiable intangible assets, net | 205.2 | 140.2 |
Operating Segments | Aviation segment |  |  |
Total assets: |  |  |
Total assets | 2,050.6 | 1,546.9 |
Operating Segments | Marine segment |  |  |
Total assets: |  |  |
Total assets | 1,287.7 | 1,149.5 |
Operating Segments | Land segment |  |  |
Total assets: |  |  |
Total assets | 1,928.5 | 1,651.5 |
Corporate |  |  |
Total assets: |  |  |
Total assets | $ 145.8 | $ 177.3 |

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