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Goodwill and Identifiable Intangible Assets - Goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Goodwill |  |
Impairment charge | $ 0 | $ (72,300,000)
Impairment of intangible assets | 0 |
Goodwill |  |
Balance at the beginning of the period | 845,500,000 | 835,900,000
Acquisitions | 13,400,000 | 63,500,000
Adjustment of purchase price allocations | 2,300,000 | 6,000,000.0
Impairment charge | 0 | (72,300,000)
Foreign currency translation of non-USD functional currency subsidiary goodwill | (8,400,000) | 12,500,000
Balance at the end of the period | 852,700,000 | 845,500,000
Aviation segment |  |
Goodwill |  |
Impairment charge |  | 0
Goodwill |  |
Balance at the beginning of the period | 326,900,000 | 266,900,000
Acquisitions | 0 | 51,200,000
Adjustment of purchase price allocations | (2,200,000) | 6,200,000
Impairment charge |  | 0
Foreign currency translation of non-USD functional currency subsidiary goodwill | (1,800,000) | 2,700,000
Balance at the end of the period | 322,900,000 | 326,900,000
Land segment |  |
Goodwill |  |
Impairment charge |  | 0
Impairment of intangible assets |  | 12,800,000
Goodwill |  |
Balance at the beginning of the period | 518,500,000 | 496,700,000
Acquisitions | 13,400,000 | 12,200,000
Adjustment of purchase price allocations | 4,500,000 | (100,000)
Impairment charge |  | 0
Foreign currency translation of non-USD functional currency subsidiary goodwill | (6,700,000) | 9,800,000
Balance at the end of the period | 529,700,000 | 518,500,000
Marine segment |  |
Goodwill |  |
Goodwill impairment and intangible asset impairment |  | 79,100,000
Impairment charge |  | (72,300,000)
Goodwill |  |
Balance at the beginning of the period | 0 | 72,300,000
Acquisitions | 0 | 0
Adjustment of purchase price allocations | 0 | 0
Impairment charge |  | (72,300,000)
Foreign currency translation of non-USD functional currency subsidiary goodwill | 0 |
Balance at the end of the period | $ 0 | $ 0

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- 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://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=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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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=108376223&loc=d3e13816-109267 + Details
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- Definition Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. + References No definition available. + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the 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 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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