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Acquisitions - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2018
acquisition
Mar. 31, 2017
acquisition
Mar. 31, 2016
airport
Sep. 30, 2017
USD ($)
Acquisitions 2017        
Acquisitions        
Number of businesses acquired | acquisition 1 2    
Goodwill anticipated to be deductible for tax purposes       $ 22.4
Acquisitions 2017 | Customer relationships        
Acquisitions        
Identifiable intangible assets       $ 33.4
Weighted average amortizable lives of identifiable intangible assets       9 years 10 months 24 days
Aviation fueling operations of certain ExxonMobil affiliates        
Acquisitions        
Number of airports to be acquired (more than) | airport     80