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Goodwill and Identifiable Intangible Assets - Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |
Balance at the beginning of the period | $ 843.7 | $ 852.7
Adjustment for sale of business | (71.6) | (13.3)
Foreign currency translation of non-USD functional currency subsidiary goodwill | 7.4 | 4.3
2020 acquisitions | 79.1 |
Balance at the end of the period | 858.6 | 843.7
Aviation segment |  |
Goodwill [Roll Forward] |  |
Balance at the beginning of the period | 323.6 | 322.9
Adjustment for sale of business | (7.0) | 0.0
Foreign currency translation of non-USD functional currency subsidiary goodwill | 3.2 | 0.7
2020 acquisitions | 79.1 |
Balance at the end of the period | 398.8 | 323.6
Land segment |  |
Goodwill [Roll Forward] |  |
Balance at the beginning of the period | 520.1 | 529.7
Adjustment for sale of business | (64.6) | (13.3)
Foreign currency translation of non-USD functional currency subsidiary goodwill | 4.3 | 3.6
2020 acquisitions | 0.0 |
Balance at the end of the period | $ 459.7 | $ 520.1

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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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- Definition Amount of divestiture 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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