Other Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring expense	$ 31.2		$ 0.0		$ 38.7	$ 0.0
Merger, acquisition and divestiture expense	1.0		0.0		3.2	0.0
Lease termination settlement	0.0		0.0	$ 5.3	0.0	5.3
Other operating income	(1.8)		(0.3)		(6.6)
Other operating expense						0.2
Other expense, net	$ 30.4		$ (0.3)		$ 35.3	$ 5.5
Remy International Inc. [Member]
Other operating income		$ (4.0)