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Goodwill (Tables)
 3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of changes in goodwill 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, 2017
 
$
326.9

 
$
518.5

 
$
845.5

Additions
 
—

 
13.7

 
13.7

Foreign exchange and other adjustments
 
(1.4
)
 
9.1

 
7.7

Balance as of March 31, 2018
 
$
325.5

 
$
541.3

 
$
866.9