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Acquisitions, Assets and Liabilities Held for Sale - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended 18 Months Ended
Jun. 23, 2016
USD ($)
May 01, 2016
USD ($)
Mar. 31, 2016
airport
Sep. 30, 2016
USD ($)
acquisition
Jun. 30, 2017
USD ($)
Jun. 22, 2016
Dec. 31, 2015
USD ($)
Acquisitions              
Previous percentage ownership of noncontrolling owners 49.00%     49.00% [1],[2]   49.00%  
Capital in excess of par value [1]       $ 418.0     $ 435.3
Disposal Group, Held-for-sale, Not Discontinued Operations | Pester              
Assets and Liabilities Held for Sale              
Cash received for disposal of retail business   $ 32.3          
Disposal Group, Held-for-sale, Not Discontinued Operations | Pester | Other (expense) income, net              
Assets and Liabilities Held for Sale              
Gain (Loss) on disposal of retail business   $ 3.8          
2016 Acquisitions              
Acquisitions              
Estimated purchase price       262.4      
Cash paid for acquisition of businesses       $ 247.9      
2016 Acquisitions | Land Segment              
Acquisitions              
Number of businesses acquired | acquisition       5      
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            
Aviation fueling operations of certain ExxonMobil affiliates              
Acquisitions              
Number of airports to be acquired (more than) | airport     80        
Aviation fueling operations of certain ExxonMobil affiliates | Forecast              
Acquisitions              
Estimated purchase price         $ 260.0    
[1] Amounts may not add due to rounding
[2] Relates to Tobras. See Note 3. Acquisitions, Asset and Liabilities Held for Sale.