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Goodwill and Other Intangibles - Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in the carrying amount of goodwill |  |  |  |  |
Net goodwill balance, January 1 |  | $ 1,702.2 |  |  |
Held for sale |  | 7.3 |  |  |
Ending balance, December 31 |  | $ 1,881.8 |  | $ 1,702.2 |
Goodwill impairment test, weighted average cost of capital discount rate for future cash flow |  | 10.40% |  |  |
Sensitivity analysis Increase in discount rate |  | 1.00% |  |  |
Sensitivity analysis decrease in operating margin assumption |  | 1.00% |  |  |
Sensitivity analysis decrease in revenue growth rate |  | 1.00% |  |  |
Engine [Member] |  |  |  |  |
Changes in the carrying amount of goodwill |  |  |  |  |
Gross goodwill balance, January 1 |  | $ 1,324.0 |  | 1,338.2 |
Accumulated impairment losses, January 1 |  |  |  | (501.8) | $ (501.8)
Net goodwill balance, January 1 |  | 822.2 |  | 836.4 |
Acquisitions |  | 0.0 |  | 0.0 |
Held for sale |  | (7.3) |  | 0.0 |
Translation adjustment and other |  | 42.9 |  | (14.2) |
Ending balance, December 31 |  | 857.8 |  | 822.2 |
Drivetrain [Member] |  |  |  |  |
Changes in the carrying amount of goodwill |  |  |  |  |
Gross goodwill balance, January 1 |  | 880.2 |  | 921.5 |
Accumulated impairment losses, January 1 |  |  |  | (0.2) | $ (0.2)
Net goodwill balance, January 1 |  | 880.0 |  | 921.3 |
Acquisitions |  | 125.8 | [1] | (12.1) |
Held for sale |  | 0.0 |  | 0.0 |
Divestitures | [2] |  |  | (24.2) |
Translation adjustment and other |  | 18.2 |  | (5.0) |
Ending balance, December 31 |  | $ 1,024.0 |  | $ 880.0 |
[1] | *Acquisitions during 2017 relate to the Company's 2017 purchase of Sevcon. Acquisitions during 2016 were related to the Company's fair value adjustments for the 2015 Remy acquisition, based on new information obtained during the measurement period.
[2] | ** Divestitures relate to the Company's 2016 disposition of Remy light vehicle aftermarket business and Divgi-Warner Private Limited.

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- Definition Amount classified as goodwill attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2473-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759 + Details
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