Business Segments - Balance Sheet Items (Details) - USD ($) $ in Millions |
Mar. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Accounts receivable, net: | ||
| Accounts receivable, net | $ 2,666.3 | $ 2,705.6 |
| Total assets: | ||
| Total assets | 5,472.1 | 5,587.8 |
| Aviation segment | ||
| Accounts receivable, net: | ||
| Accounts receivable, net | 991.1 | 1,013.0 |
| Allowance for bad debt | 11.1 | 10.8 |
| Land segment | ||
| Accounts receivable, net: | ||
| Accounts receivable, net | 912.4 | 874.7 |
| Allowance for bad debt | 4.1 | 6.6 |
| Marine segment | ||
| Accounts receivable, net: | ||
| Accounts receivable, net | 762.7 | 817.9 |
| Allowance for bad debt | 9.4 | 10.4 |
| Operating Segments | Aviation segment | ||
| Total assets: | ||
| Total assets | 2,160.2 | 2,240.4 |
| Operating Segments | Land segment | ||
| Total assets: | ||
| Total assets | 2,144.3 | 2,091.4 |
| Operating Segments | Marine segment | ||
| Total assets: | ||
| Total assets | 986.5 | 1,097.1 |
| Corporate | ||
| Total assets: | ||
| Total assets | $ 181.0 | $ 158.9 |