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Goodwill
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Goodwill
 
Goodwill arises because the purchase price paid for our acquisitions reflects numerous factors, including the strategic fit and expected synergies these acquisitions bring to our existing operations. Goodwill is recorded at fair value and is reviewed at least annually for impairment.
The following table provides the components of and changes in the carrying amount of goodwill (in millions):
 
 
Aviation

 
Land

 
Total

Balance as of December 31, 2018
 
$
322.9

 
$
529.7

 
$
852.7

Additions
 
—

 
—

 
—

Foreign exchange and other adjustments
 
(1.2
)
 
(0.9
)
 
(2.1
)
Balance as of June 30, 2019
 
$
321.8

 
$
528.8

 
$
850.6