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Reporting Segments and Related Information - Adjusted EBIT (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted EBIT |  |  |  |  |  |  |  |  | $ 1,195.3 | $ 1,227.3 | $ 1,078.2
Restructuring expense | $ 24.4 | $ 6.3 | $ 10.5 | $ 9.4 | $ 17.8 | $ 9.6 | $ 13.0 | $ 38.4 | 65.7 | 90.8 | 39.8
Intangible asset impairment |  |  |  |  |  |  |  |  | 0.0 | 10.3 | 12.5
Pension settlement |  |  |  |  |  |  |  |  | 25.7 | 3.1 | 0.0
Merger and acquisition expense | 17.9 | 3.9 |  |  |  |  |  |  | 21.8 | 0.0 | 0.0
Gain on previously held equity interest |  |  |  |  |  |  |  |  | (10.8) | 0.0 | 0.0
Program termination agreement |  |  |  |  |  |  |  |  |  | 0.0 | 11.3
Retirement related obligations |  |  |  |  |  |  |  |  |  |  | 5.9
Corporate, including equity in affiliates' earnings and stock-based compensation |  |  |  |  |  |  |  |  | 113.2 | 112.1 | 110.0
Interest income | (2.2) | (2.0) | (1.6) | (1.7) | (1.2) | (1.4) | (1.4) | (1.5) | (7.5) | (5.5) | (4.8)
Interest expense and finance charges | 17.8 | 15.0 | 17.6 | 10.0 | 10.2 | 9.0 | 9.0 | 8.2 | 60.4 | 36.4 | 34.2
Earnings before income taxes and noncontrolling interest |  |  |  |  |  |  |  |  | 926.8 | 980.1 | 869.3
Provision for income taxes | 61.2 | 66.9 | 80.2 | 72.1 | 67.3 | 71.9 | 85.3 | 68.1 | 280.4 | 292.6 | 218.3
Net earnings | 135.4 | 165.9 | 157.4 | 187.7 | 147.4 | 173.0 | 199.9 | 167.2 | 646.4 | 687.5 | 651.0
Net earnings attributable to the noncontrolling interest, net of tax | 10.1 | 8.5 | 9.3 | 8.8 | 7.5 | 6.4 | 9.7 | 8.1 | 36.7 | 31.7 | 26.7
Net earnings attributable to BorgWarner Inc. | 125.3 | 157.4 | 148.1 | 178.9 | 139.9 | 166.6 | 190.2 | 159.1 | 609.7 | 655.8 | 624.3
Tax benefit associated with restructuring | $ 0.4 | $ 0.7 | $ 2.2 | $ 1.2 | 3.4 | 1.4 | $ 1.7 | $ 8.8 | 3.7 | 15.3 | 5.1
Engine [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted EBIT |  |  |  |  |  |  |  |  | 900.7 | 924.0 | 826.0
Drivetrain [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted EBIT |  |  |  |  |  |  |  |  | 294.6 | 303.3 | 252.2
U.S. Plans: |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pension settlement |  |  |  |  | $ 0.4 | $ 2.7 |  |  | $ 25.7 | $ 3.1 | $ 0.0

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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=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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