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Goodwill and Identifiable Intangible Assets - Goodwill (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Write-downs to goodwill or identifiable intangible assets | $ 0 |
Goodwill |  |
Balance at the beginning of the period | 675,800,000 | $ 653,300,000
Acquisitions | 173,300,000 | 39,400,000
Goodwill classified as held for sale |  | (5,900,000)
Adjustment of purchase price allocations | 6,900,000 |
Foreign currency translation of non-USD functional currency subsidiary goodwill | (20,300,000) | (11,000,000)
Balance at the end of the period | 835,800,000 | 675,800,000
Aviation segment |  |
Goodwill |  |
Balance at the beginning of the period | 173,700,000 | 174,300,000
Acquisitions | 95,600,000 | 1,700,000
Goodwill classified as held for sale |  | 0
Adjustment of purchase price allocations | 1,300,000 |
Foreign currency translation of non-USD functional currency subsidiary goodwill | (3,700,000) | (2,300,000)
Balance at the end of the period | 266,800,000 | 173,700,000
Marine segment |  |
Goodwill |  |
Balance at the beginning of the period | 71,400,000 | 73,100,000
Acquisitions | 0 | 0
Goodwill classified as held for sale |  | 0
Adjustment of purchase price allocations | 100,000 |
Foreign currency translation of non-USD functional currency subsidiary goodwill | 700,000 | (1,700,000)
Balance at the end of the period | 72,300,000 | 71,400,000
Land segment |  |
Goodwill |  |
Balance at the beginning of the period | 430,700,000 | 405,900,000
Acquisitions | 77,700,000 | 37,700,000
Goodwill classified as held for sale |  | (5,900,000)
Adjustment of purchase price allocations | 5,500,000 |
Foreign currency translation of non-USD functional currency subsidiary goodwill | (17,300,000) | (7,000,000)
Balance at the end of the period | $ 496,700,000 | $ 430,700,000

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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