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Acquisitions and Divestitures - 2016 Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended | 18 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 23, 2016 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2016 airport | Dec. 31, 2016 USD ($) acquisition | Dec. 31, 2014 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 835.8 |  | $ 835.8 | $ 653.3 |  | $ 675.8
Previous percentage ownership of noncontrolling owners | 49.00% | 49.00% |  | 49.00% |  |  |
Capital in excess of par value |  | $ 399.9 |  | $ 399.9 |  |  | 435.3
Increase in noncontrolling interest equity |  |  |  |  | 19.4 |  |
Crude Oil Joint Venture Partner |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Write off of outstanding amounts owed by former joint venture partner |  | 7.5 |  |  |  |  |
Land segment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | 496.7 |  | 496.7 | $ 405.9 |  | $ 430.7
Aviation fueling operations of certain ExxonMobil affiliates |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of airports to be acquired (more than) | airport |  |  | 80 |  |  |  |
Aviation fueling operations of certain ExxonMobil affiliates | Forecast |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated purchase price |  |  |  |  |  | $ 260.0 |
2016 Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated purchase price |  |  |  | 446.9 |  |  |
Goodwill |  | 173.3 |  | 173.3 |  |  |
Goodwill anticipated to be deductible for tax purposes |  | 133.4 |  | 133.4 |  |  |
2016 Acquisitions | Trademark/Trade name rights |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Identifiable intangible assets |  | 9.5 |  | 9.5 |  |  |
2016 Acquisitions | Customer relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Identifiable intangible assets |  | 105.1 |  | $ 105.1 |  |  |
Weighted average amortizable lives of identifiable intangible assets |  |  |  | 5 years 7 months 8 days |  |  |
2016 Acquisitions | Other |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Identifiable intangible assets |  | $ 3.9 |  | $ 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 |  |  |
Tobras |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated 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 |  |  |  |  |  |
Increase in noncontrolling interest equity | $ 7.2 |  |  |  |  |  |

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