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Acquisitions - Narrative (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 23, 2016 USD ($) | Mar. 31, 2017 acquisition | Mar. 31, 2016 acquisition airport | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2016
Acquisitions |  |  |  |  |  |
Previous percentage ownership of noncontrolling owners | 49.00% |  |  |  |  | 49.00%
Capital in excess of par value |  |  |  | $ 373.3 | $ 399.9 |
Acquisitions 2017 |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Number of businesses acquired | acquisition |  | 2 |  |  |  |
Goodwill anticipated to be deductible for tax purposes |  |  |  | 22.4 |  |
Estimated purchase price |  |  |  | 91.9 |  |
Acquisitions 2017 | Customer relationships |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 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 |  |  |
Tobras |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
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 |  |  |  |  |
Acquisitions, 2016 | Land segment |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Number of businesses acquired | acquisition |  |  | 3 |  |  |

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