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Goodwill - Components of and Changes in Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)
Goodwill [Roll Forward]
Balance as of December 31, 2019	$ 843.7
Additions	78.7
Foreign exchange and other adjustments	(8.9)
Balance as of June 30, 2020	913.5
Aviation
Goodwill [Roll Forward]
Balance as of December 31, 2019	323.6
Additions	78.7
Foreign exchange and other adjustments	(0.1)
Balance as of June 30, 2020	402.2
Land
Goodwill [Roll Forward]
Balance as of December 31, 2019	520.1
Additions	0.0
Foreign exchange and other adjustments	(8.8)
Balance as of June 30, 2020	511.3
Land | Land Reporting Unit
Goodwill [Roll Forward]
Balance as of June 30, 2020	$ 446.7

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

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-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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-Publisher FASB
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-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-SubTopic 20
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- Definition

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