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Restructuring (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) employee labor_union | Dec. 31, 2015 USD ($) | Sep. 27, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Agreements with Labor Unions, Number | labor_union |  |  |  |  |  |  | 3 |  |
Restructuring expense | $ 45.2 | $ 13.3 | $ 1.3 | $ 19.2 | $ 6.4 | $ 58.5 | $ 26.9 | $ 65.7 |
Drivetrain [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Employee termination benefits, number of employees effected | employee |  |  |  |  |  |  | 450 |  |
Employee termination benefits |  |  |  |  |  |  | $ 20.1 | 3.0 |
Other restructuring charges |  |  |  |  |  |  | 7.9 | 5.2 |
Restructuring expense |  |  |  |  |  |  | 8.2 | 28.0 |
Gustav Wahler GmbH u. Co. KG and General Partner [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Employee termination benefits |  |  |  |  |  |  | 11.6 | 9.6 |
Remy International Inc. [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Employee termination benefits |  |  |  |  |  |  | 2.0 | 10.1 |
Other restructuring charges |  |  |  |  |  |  | 3.1 |  |
Restructuring expense |  |  |  |  |  |  | 10.1 | 6.1 |
Employee Severance [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring Reserve | $ 5.4 |  |  |  |  | 5.4 | 6.4 | $ 29.4 |
Restructuring expense |  |  |  |  |  | 6.1 | 10.6 |  |
Payments for Restructuring |  |  |  |  |  | (7.5) | (33.8) |  |
Restructuring Reserve, Translation Adjustment |  |  |  |  |  | $ 0.4 | 0.2 |  |
Sevcon, Inc [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired | 100.00% |  |  |  |  | 100.00% |  |  | 100.00%
Remy International Inc. [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  |  |  | 100.00% |
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring expense |  |  |  |  |  |  | 12.5 |  |
Engine [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring expense |  |  |  |  |  | $ 48.2 |  |  |
Engine [Member] | Employee Severance [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring Reserve | $ 1.3 |  |  |  |  | 1.3 | 2.7 | $ 4.1 |
Restructuring expense |  |  |  |  |  | 1.4 | 5.6 |  |
Payments for Restructuring |  |  |  |  |  | (2.9) | (6.9) |  |
Restructuring Reserve, Translation Adjustment |  |  |  |  |  | 0.1 | (0.1) |  |
Drivetrain [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring expense |  |  |  |  |  | 6.8 |  |  |
Drivetrain [Member] | Employee Severance [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring Reserve | $ 4.1 |  |  |  |  | 4.1 | 3.7 | $ 25.3 |
Restructuring expense |  |  |  |  |  | 4.7 | 5.0 |  |
Payments for Restructuring |  |  |  |  |  | (4.6) | (26.9) |  |
Restructuring Reserve, Translation Adjustment |  |  |  |  |  | $ 0.3 | $ 0.3 |  |

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