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Goodwill (Detail) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($)
Goodwill [Roll Forward] |  |
Balance at January 1, 2018 | $ 1,401.3 |
Affiliate transaction | 21.4 |
Foreign currency translation and other | 42.0 |
Balance at March 31, 2018 | 1,464.7 | [1]
Operating segments | Seating |  |
Goodwill [Roll Forward] |  |
Balance at January 1, 2018 | 1,274.4 |
Affiliate transaction | 0.0 |
Foreign currency translation and other | 19.3 |
Balance at March 31, 2018 | 1,293.7 |
Operating segments | E-Systems |  |
Goodwill [Roll Forward] |  |
Balance at January 1, 2018 | 126.9 |
Foreign currency translation and other | 22.7 |
Balance at March 31, 2018 | 171.0 |
Operating segments | E-Systems | Lear FAWSN |  |
Goodwill [Roll Forward] |  |
Affiliate transaction | $ 21.4 |
[1] | Unaudited.

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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=77989000&loc=SL49117168-202975 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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