Restructuring (Details) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Sep. 30, 2015 USD ($) employee labor_union	Sep. 30, 2014 USD ($) employee
Restructuring Cost and Reserve [Line Items]
Finalization of severance agreements, number of labor unions | labor_union							2
Restructuring Reserve [Roll Forward]
Provision	$ 9.3			$ 13.1			$ 41.3	$ 67.6
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	18.3	$ 35.2	$ 43.9	44.4	$ 41.2	$ 11.3	43.9	11.3
Provision	3.2	9.4	7.8	7.5	10.0	32.8
Cash payments	(9.6)	(27.6)	(11.6)	(2.5)	(6.6)	(2.9)
Translation adjustment	0.1	1.3	(4.9)	(3.4)	(0.2)
Ending Balance	12.0	18.3	35.2	46.0	44.4	41.2	12.0	46.0
Employee Severance [Member] | Drivetrain [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	16.1	33.9	41.9	42.8	39.3	8.4	41.9	8.4
Provision	0.4	6.8	7.4	5.3	6.4	32.1
Cash payments	(6.1)	(25.9)	(10.7)	(1.1)	(2.7)	(1.2)
Translation adjustment	0.1	1.3	(4.7)	(3.2)	(0.2)
Ending Balance	10.5	16.1	33.9	43.8	42.8	39.3	10.5	43.8
Employee Severance [Member] | Engine [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	2.2	1.3	2.0	1.6	1.9	2.9	2.0	2.9
Provision	2.8	2.6	0.4	2.2	3.6	0.7
Cash payments	(3.5)	(1.7)	(0.9)	(1.4)	(3.9)	(1.7)
Translation adjustment	0.0	0.0	(0.2)	(0.2)	0.0
Ending Balance	1.5	$ 2.2	$ 1.3	2.2	$ 1.6	$ 1.9	1.5	2.2
Corporate and Other [Member]
Restructuring Reserve [Roll Forward]
Provision	3.0			3.5			$ 15.1	$ 6.6
Gustav Wahler GmbH u. Co. KG and its general partner
Restructuring Cost and Reserve [Line Items]
Employee termination costs, number of employees | employee							40	80
Employee termination benefits	2.4			2.2			$ 5.0	$ 5.3
Drivetrain [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs, number of employees | employee							350
Employee termination benefits	0.4			5.3			$ 13.6	43.8
Other expense	3.1			2.1			5.1	8.4
Restructuring Reserve [Roll Forward]
Provision	$ 3.5			$ 7.4			$ 18.7	$ 52.2