Restructuring (Details) $ in Millions	3 Months Ended							12 Months Ended
	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) employee labor_union	Dec. 31, 2015 USD ($) employee	Dec. 31, 2014 USD ($) employee	Nov. 10, 2015	Feb. 28, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Agreements with Labor Unions, Number | labor_union								3
Asset Impairment Charges	$ 106.5
Restructuring expense	$ 1.3	$ 19.2	$ 6.4	$ 24.4	$ 6.3	$ 10.5	$ 9.4	$ 26.9	$ 65.7	$ 90.8
Drivetrain [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination benefits, number of employees effected | employee								450
Employee termination benefits								$ 3.0	20.1	50.6
Other restructuring charges								5.2	7.9	11.2
Restructuring expense								8.2	$ 28.0	$ 61.8
Gustav Wahler GmbH u. Co. KG and General Partner [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination benefits, number of employees effected | employee									70	95
Employee termination benefits								9.6	$ 11.6	$ 6.5
Corporate and Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense					$ 3.0	$ 9.4	$ 2.7		12.5	12.0
Remy International Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination benefits								2.0	10.1
Other restructuring charges								3.1
Restructuring expense								6.1	10.1
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve				29.4				6.4	29.4	43.9
Restructuring expense								10.6	43.9
Payments for Restructuring								(33.8)	(55.0)
Restructuring Reserve, Translation Adjustment								0.2	(3.8)
Remy International Inc [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense									0.4
Remy International 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]
Business acquisition, percentage of voting interests acquired												100.00%
Engine [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve				4.1				2.7	4.1	2.0
Restructuring expense								5.6	11.3
Payments for Restructuring								(6.9)	(9.0)
Restructuring Reserve, Translation Adjustment								(0.1)	(0.2)
Engine [Member] | Remy International Inc [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense									0.0
Drivetrain [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve				$ 25.3				3.7	25.3	$ 41.9
Restructuring expense								5.0	32.6
Payments for Restructuring								(26.9)	(46.0)
Restructuring Reserve, Translation Adjustment								$ 0.3	(3.6)
Drivetrain [Member] | Remy International Inc [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense									$ 0.4