Restructuring (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 labor_union	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Finalization of severance agreements, number of labor unions	2
Expected employee termination benefit costs to be incurred	$ 6
Restructuring Reserve [Roll Forward]
Provision	12.1	39.5
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	43.9	11.3
Provision	7.8	32.8
Cash payments	(11.6)	(2.9)
Translation adjustment	(4.9)
Ending Balance	35.2	41.2
Employee Severance [Member] | Drivetrain [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	41.9	8.4
Provision	7.4	32.1
Cash payments	(10.7)	(1.2)
Translation adjustment	(4.7)
Ending Balance	33.9	39.3
Employee Severance [Member] | Engine [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	2.0	2.9
Provision	0.4	0.7
Cash payments	(0.9)	(1.7)
Translation adjustment	(0.2)
Ending Balance	1.3	1.9
Corporate and Other [Member]
Restructuring Reserve [Roll Forward]
Provision	2.7	1.1
Drivetrain [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs, number of employees	350
Employee termination benefits	6.4	32.1
Other expense	0.9	3.3
Restructuring Reserve [Roll Forward]
Provision	$ 7.3	$ 35.4