Other Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 10, 2015	Jan. 29, 2015
Restructuring expense	$ 24.4	$ 6.3	$ 10.5	$ 9.4	$ 17.8	$ 9.6	$ 13.0	$ 38.4	$ 65.7	$ 90.8	$ 39.8
Pension settlement									25.7	3.1	0.0
Merger and acquisition expense	17.9	3.9							21.8	0.0	0.0
Investment banker fees									13.0
Professional Fees									8.8
Gain on previously held equity interest									(10.8)	0.0	0.0
Intangible asset impairment									0.0	10.3	12.5
Program termination agreement										0.0	11.3
Retirement related obligations											5.9
Other									(1.0)	(10.4)	(6.9)
Other expense, net	$ 68.0	$ 13.1	$ 19.1	$ 1.2	31.7	12.3	$ 11.0	$ 38.8	101.4	93.8	62.6
United States Pension Plan of US Entity [Member]
Pension settlement					$ 0.4	$ 2.7			25.7	3.1	0.0
Pension Benefit Obligation Settled									48.1
Pension plan assets transferred									48.1
Remy International Inc. [Member]
Business acquisition, percentage of voting interests acquired												100.00%
BERU Diesel Start Systems Pvt. Ltd.
Business acquisition, percentage of voting interests acquired													51.00%
Gain on previously held equity interest									$ (10.8)	$ 0.0	$ 0.0