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Restructuring (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) employee | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) employee labor_union | Sep. 27, 2017 | Nov. 10, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Agreements with Labor Unions, Number | labor_union |  |  |  |  |  |  |  |  | 3 |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision | $ 22.7 | $ 5.7 | $ 31.2 | $ 7.5 | $ 45.2 | $ 13.3 | $ 67.1 | $ 58.5 | $ 26.9 |  |
Employee Severance [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  | 5.4 |  |  | 5.4 | 6.4 |  |  |
Provision |  |  |  |  |  |  | 41.5 | 6.1 |  |  |
Cash payments |  |  |  |  |  |  | (21.8) | (7.5) |  |  |
Translation adjustment |  |  |  |  |  |  | (0.4) | 0.4 |  |  |
Restructuring reserve, ending balance | 24.7 |  |  |  | 5.4 |  | 24.7 | 5.4 | 6.4 |  |
Sevcon, Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  |  |  |  |  | 100.00% |
Gustav Wahler GmbH u. Co. KG and General Partner [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Employee termination benefits |  |  |  |  |  |  |  |  | 9.6 |  |
Remy International Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Employee termination benefits |  |  |  |  |  |  |  |  | 2.0 |  |
Other restructuring charges |  |  |  |  |  |  |  |  | 3.1 |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  | 100.00%
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision |  |  |  |  |  |  |  |  | 6.1 |  |
Engine [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision |  |  |  |  |  |  | $ 53.5 | 48.2 |  |  |
Engine [Member] | Emissions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Employee termination benefits, number of employees effected | employee |  |  |  |  |  |  | 140 |  |  |  |
Engine [Member] | Employee Severance [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  | 1.3 |  |  | $ 1.3 | 2.7 |  |  |
Provision |  |  |  |  |  |  | 34.4 | 1.4 |  |  |
Cash payments |  |  |  |  |  |  | (14.5) | (2.9) |  |  |
Translation adjustment |  |  |  |  |  |  | (0.4) | 0.1 |  |  |
Restructuring reserve, ending balance | 20.8 |  |  |  | 1.3 |  | 20.8 | 1.3 | $ 2.7 |  |
Engine [Member] | Employee Severance [Member] | Emissions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision |  |  |  |  |  |  | 28.4 |  |  |  |
Engine [Member] | Employee Severance [Member] | Non-Emissions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision |  |  |  |  |  |  | 6.0 |  |  |  |
Drivetrain [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Employee termination benefits, number of employees effected | employee |  |  |  |  |  |  |  |  | 450 |  |
Employee termination benefits |  |  |  |  |  |  |  |  | $ 3.0 |  |
Other restructuring charges |  |  |  |  |  |  |  |  | 5.2 |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision |  |  |  |  |  |  | 10.3 | 6.8 | 8.2 |  |
Drivetrain [Member] | Employee Severance [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  | $ 4.1 |  |  | 4.1 | 3.7 |  |  |
Provision |  |  |  |  |  |  | 7.1 | 4.7 |  |  |
Cash payments |  |  |  |  |  |  | (7.3) | (4.6) |  |  |
Translation adjustment |  |  |  |  |  |  | 0.0 | 0.3 |  |  |
Restructuring reserve, ending balance | $ 3.9 |  |  |  | $ 4.1 |  | $ 3.9 | $ 4.1 | $ 3.7 |  |

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