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Goodwill | 6 Months Ended
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Jun. 30, 2018
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, 2017 |  | $ | 326.9 |  |  | $ | 518.5 |  |  | $ | 845.5 |
Additions |  | — |  |  | 13.4 |  |  | 13.4 |
Foreign exchange and other adjustments |  | (4.5 | ) |  | 2.3 |  |  | (2.2 | )
Balance as of June 30, 2018 |  | $ | 322.4 |  |  | $ | 534.2 |  |  | $ | 856.7 |

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- Definition The entire disclosure for goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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