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Acquisitions - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
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Mar. 31, 2018 acquisition | Jun. 30, 2017 USD ($) acquisition | Mar. 31, 2016 airport | Jun. 30, 2017 USD ($)
Acquisitions 2017 |  |  |  |
Acquisitions |  |  |  |
Number of businesses acquired | acquisition | 1 | 2 |  |
Goodwill anticipated to be deductible for tax purposes |  | $ 22.4 |  | $ 22.4
Acquisitions 2017 | Customer relationships |  |  |  |
Acquisitions |  |  |  |
Identifiable intangible assets |  | $ 40.1 |  | $ 40.1
Weighted average amortizable lives of identifiable intangible assets |  |  |  | 6 years 10 months 24 days
Aviation fueling operations of certain ExxonMobil affiliates |  |  |  |
Acquisitions |  |  |  |
Number of airports to be acquired (more than) | airport |  |  | 80 |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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