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Goodwill and Other Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of goodwill [Text Block] |
| 2017 |  | 2016
(millions of dollars) | Engine |  | Drivetrain |  | Engine |  | Drivetrain
Gross goodwill balance, January 1 | $ | 1,324.0 |  |  | $ | 880.2 |  |  | $ | 1,338.2 |  |  | $ | 921.5 |
Accumulated impairment losses, January 1 | (501.8 | ) |  | (0.2 | ) |  | (501.8 | ) |  | (0.2 | )
Net goodwill balance, January 1 | $ | 822.2 |  |  | $ | 880.0 |  |  | $ | 836.4 |  |  | $ | 921.3 |
Goodwill during the year: |  |  |  |  |  |  |  |  |  |  |
Acquisitions* | — |  |  | 125.8 |  |  | — |  |  | (12.1 | )
Held for sale | (7.3 | ) |  | — |  |  | — |  |  | — |
Divestitures** | — |  |  | — |  |  | — |  |  | (24.2 | )
Translation adjustment and other | 42.9 |  |  | 18.2 |  |  | (14.2 | ) |  | (5.0 | )
Ending balance, December 31 | $ | 857.8 |  |  | $ | 1,024.0 |  |  | $ | 822.2 |  |  | $ | 880.0 |
________________
* | 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.
** Divestitures relate to the Company's 2016 disposition of Remy light vehicle aftermarket business and Divgi-Warner Private Limited.
Intangible assets disclosure [Text Block] |
| December 31, 2017 |  | December 31, 2016
(millions of dollars) | Gross carrying amount |  | Accumulated amortization |  | Net carrying amount |  | Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Amortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patented and unpatented technology | $ | 157.7 |  |  | $ | 52.9 |  |  | $ | 104.8 |  |  | $ | 108.1 |  |  | $ | 41.5 |  |  | $ | 66.6 |
Customer relationships | 507.6 |  |  | 181.0 |  |  | 326.6 |  |  | 481.4 |  |  | 141.2 |  |  | 340.2 |
Miscellaneous | 4.9 |  |  | 3.2 |  |  | 1.7 |  |  | 5.3 |  |  | 3.4 |  |  | 1.9 |
Total amortized intangible assets | 670.2 |  |  | 237.1 |  |  | 433.1 |  |  | 594.8 |  |  | 186.1 |  |  | 408.7 |
In-process R&D | 3.8 |  |  | — |  |  | 3.8 |  |  | 3.8 |  |  | — |  |  | 3.8 |
Unamortized trade names | 55.8 |  |  | — |  |  | 55.8 |  |  | 51.0 |  |  | — |  |  | 51.0 |
Total other intangible assets | $ | 729.8 |  |  | $ | 237.1 |  |  | $ | 492.7 |  |  | $ | 649.6 |  |  | $ | 186.1 |  |  | $ | 463.5 |
Intangible assets gross roll forward [Text Block] |
(millions of dollars) | 2017 |  | 2016
Beginning balance, January 1 | $ | 649.6 |  |  | $ | 705.3 |
Acquisitions* | 72.6 |  |  | — |
Held for sale | (32.7 | ) |  | — |
Impairment** | — |  |  | (23.9 | )
Divestitures*** | — |  |  | (19.9 | )
Translation adjustment | 40.3 |  |  | (11.9 | )
Ending balance, December 31 | $ | 729.8 |  |  | $ | 649.6 |
________________
* | Acquisitions primarily relate to the Company's 2017 purchase of Sevcon.
** Relates to the impairment of the Company's Etatech ECCOS intellectual technology in 2016. *** Divestiture relates to the Company's sale of Remy light vehicle aftermarket business in 2016.
Accumulated amortization net [Text Block] |
(millions of dollars) | 2017 |  | 2016
Beginning balance, January 1 | $ | 186.1 |  |  | $ | 161.5 |
Amortization | 40.0 |  |  | 40.4 |
Held for sale | (11.6 | ) |  | — |
Impairment | — |  |  | (8.2 | )
Divestitures | — |  |  | (0.3 | )
Translation adjustment | 22.6 |  |  | (7.3 | )
Ending balance, December 31 | $ | 237.1 |  |  | $ | 186.1 |

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