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Reporting Segments and Related Information - Adjusted EBIT (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBIT |  |  |  |  |  |  |  |  | $ 1,445.5 |  | $ 1,311.8 |  | $ 1,218.5 |
Asset impairment and loss on divestiture |  |  |  |  | $ 20.6 |  |  |  | 71.0 |  | 127.1 |  | 0.0 |
Restructuring expense | $ 45.2 | $ 13.3 |  |  |  | $ 1.3 | $ 19.2 | $ 6.4 | 58.5 |  | 26.9 |  | 65.7 |
Merger and acquisition expense | 3.6 | 6.4 |  |  | 4.8 | 5.9 | 7.2 | 5.8 | 10.0 |  | 23.7 |  | 21.8 |
Lease termination settlement |  |  |  | $ 5.3 |  |  |  |  | 5.3 |  | 0.0 |  | 0.0 |
Other expense, net |  |  |  |  |  |  |  |  | 2.1 |  | 0.0 |  | 0.0 |
Asbestos-related charge |  |  |  |  |  |  |  |  | 0.0 |  | 703.6 |  | 0.0 |
Intangible asset impairment |  |  |  |  |  |  |  |  | 0.0 |  | 12.6 |  | 0.0 |
Contract expiration gain |  |  |  |  |  |  |  |  | 0.0 |  | (6.2) |  | 0.0 |
Pension settlement loss |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 25.7 |
Gain on previously held equity interest |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | (10.8) |
Corporate, including equity in affiliates' earnings and stock-based compensation |  |  |  |  |  |  |  |  | 170.3 |  | 155.3 |  | 136.4 |
Interest income | (1.6) | (1.3) | $ (1.4) | (1.5) | (1.6) | (1.6) | (1.5) | (1.6) | (5.8) |  | (6.3) |  | (7.5) |
Interest expense and finance charges | 16.9 | 17.6 | 18.0 | 18.0 | 19.5 | 22.4 | 21.4 | 21.3 | 70.5 |  | 84.6 |  | 60.4 |
Earnings before income taxes and noncontrolling interest |  |  |  |  |  |  |  |  | 1,063.6 |  | 190.5 |  | 926.8 |
Provision for income taxes | 338.4 | 79.4 | 76.2 | 86.3 | (183.1) | 48.8 | 84.2 | 80.4 | 580.3 |  | 30.3 |  | 280.4 |
Net earnings | (132.0) | 194.6 | 221.1 | 199.6 | (281.5) | 93.1 | 175.4 | 173.2 | 483.3 |  | 160.2 |  | 646.4 |
Net earnings attributable to the noncontrolling interest, net of tax | 14.2 | 9.7 | 9.1 | 10.4 | 11.8 | 9.8 | 11.0 | 9.1 | 43.4 | [1] | 41.7 | [1] | 36.7 | [1]
Net earnings attributable to BorgWarner Inc. | $ (146.2) | $ 184.9 | $ 212.0 | $ 189.2 | $ (293.3) | $ 83.3 | $ 164.4 | $ 164.1 | 439.9 |  | 118.5 |  | 609.7 |
Engine [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBIT |  |  |  |  |  |  |  |  | 995.7 |  | 947.3 |  | 913.9 |
Restructuring expense |  |  |  |  |  |  |  |  | 48.2 |  |  |  |  |
Drivetrain [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBIT |  |  |  |  |  |  |  |  | 449.8 |  | $ 364.5 |  | $ 304.6 |
Restructuring expense |  |  |  |  |  |  |  |  | $ 6.8 |  |  |  |  |
[1] | *Net of income taxes.

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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