Restructuring (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended										9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 labor_union	Sep. 30, 2013	Sep. 30, 2014 Employee Severance [Member]	Jun. 30, 2014 Employee Severance [Member]	Mar. 31, 2014 Employee Severance [Member]	Sep. 30, 2014 Employee Severance [Member] Drivetrain [Member]	Jun. 30, 2014 Employee Severance [Member] Drivetrain [Member]	Mar. 31, 2014 Employee Severance [Member] Drivetrain [Member]	Sep. 30, 2014 Employee Severance [Member] Engine [Member]	Jun. 30, 2014 Employee Severance [Member] Engine [Member]	Mar. 31, 2014 Employee Severance [Member] Engine [Member]	Sep. 30, 2014 Corporate and Other [Member]	Sep. 30, 2014 Corporate and Other [Member]	Sep. 30, 2014 Wahler	Sep. 30, 2014 Wahler employee	Sep. 30, 2014 Drivetrain [Member]	Sep. 30, 2014 Drivetrain [Member] employee	Sep. 30, 2014 Drivetrain [Member] Employee Severance [Member]	Feb. 28, 2014 Wahler
Restructuring Cost and Reserve [Line Items]
Finalization of severance agreements, number of labor unions			2
Employee termination costs, number of employees																	80		350
Employee termination benefits																$ 2.2	$ 5.3	$ 5.3	$ 43.8
Other expense																		2.1	8.4
Expected employee termination benefit costs to be incurred	15		15
Equity interest acquired																					100.00%
Expected employee termination benefit costs to be incurred, period of recognition																				2 years
Restructuring Reserve [Roll Forward]
Beginning Balance					44.4	41.2	11.2	42.8	39.3	8.4	1.6	1.9	2.8
Provision	13.1	0	67.6	0	7.5	10.0	32.8	5.3	6.4	32.1	2.2	3.6	0.7	3.5	6.6			7.4	52.2
Cash payments					(2.5)	(6.6)	(2.8)	(1.1)	(2.7)	(1.2)	(1.4)	(3.9)	(1.6)
Translation adjustment					(3.4)	(0.2)	0	(3.2)	(0.2)	0	(0.2)	0	0
Ending Balance					$ 46.0	$ 44.4	$ 41.2	$ 43.8	$ 42.8	$ 39.3	$ 2.2	$ 1.6	$ 1.9