Other Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring expense	$ 5.7		$ 13.3		$ 44.4	$ 13.3
Merger, acquisition and divestiture expense	1.6		6.4		4.8	6.4
Lease termination settlement	0.0		0.0	$ 5.3	0.0	5.3
Other operating income	(0.2)				(6.8)
Other operating expense			2.3			2.5
Other expense, net	$ 7.1		$ 22.0		$ 42.4	$ 27.5
Remy International Inc. [Member]
Other operating income		$ (4.0)