Restructuring (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Reserve [Roll Forward]
Provision	$ 7.5	$ 0.0
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	5.4	6.4
Provision	1.8
Cash payments	(1.7)	(3.7)
Translation adjustment	0.1	0.1
Ending Balance	5.6	2.8
Employee Severance [Member] | Drivetrain [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	4.1	3.7
Provision	1.1
Cash payments	(0.6)	(1.6)
Translation adjustment	0.1	0.0
Ending Balance	4.7	2.1
Employee Severance [Member] | Engine [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	1.3	2.7
Provision	0.7
Cash payments	(1.1)	(2.1)
Translation adjustment	0.0	0.1
Ending Balance	0.9	$ 0.7
Engine [Member]
Restructuring Reserve [Roll Forward]
Provision	4.8
Drivetrain [Member]
Restructuring Reserve [Roll Forward]
Provision	$ 2.3