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Acquisitions and Divestitures - 2016 Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 23, 2016 USD ($) | Mar. 31, 2016 airport | Dec. 31, 2016 USD ($) acquisition | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 835.8 | $ 845.5 | $ 675.8
Previous percentage ownership of noncontrolling owners | 49.00% |  | 49.00% |  |
Capital in excess of par value |  |  | $ 399.9 | 354.9 |
Land segment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | 496.7 | 518.5 | 430.7
Aviation segment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | 266.8 | $ 326.9 | $ 173.7
Aviation fueling operations of certain ExxonMobil affiliates |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of airports to be acquired (more than) | airport |  | 80 |  |  |
2016 Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | 173.3 |  |
Goodwill anticipated to be deductible for tax purposes |  |  | 133.4 |  |
Purchase price |  |  | 446.9 |  |
2016 Acquisitions | Trademark/Trade name rights |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets |  |  | 9.5 |  |
2016 Acquisitions | Customer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets |  |  | $ 105.1 |  |
Weighted average amortizable lives of identifiable intangible assets |  |  | 5 years 7 months 6 days |  |
2016 Acquisitions | Others |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets |  |  | $ 3.9 |  |
Weighted average amortizable lives of identifiable intangible assets |  |  | 2 years 1 month 6 days |  |
2016 Acquisitions | Land segment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of business acquired | acquisition |  |  | 6 |  |
Goodwill |  |  | $ 77.7 |  |
2016 Acquisitions | Aviation segment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 95.6 |  |
Tobras |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price | $ 3.7 |  |  |  |
Previous percentage of ownership of parent | 51.00% |  |  |  |
Capital in excess of par value | $ 10.9 |  |  |  |
Cash paid for acquisition of businesses | 3.7 |  |  |  |
Initial noncontrolling interest upon acquisition of businesses | $ 7.2 |  |  |  |

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