Impairment and Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impairment and Restructuring Charges for the Mobile Segment
Impairment charges									$ 0.1	$ 3.9	$ 3.3
Severance expense and related benefit costs						$ 3.3		$ 7.7	3.5	15.3	7.7
Exit costs						0.8		0.2	0.7	2.5	3.7
Total	$ 0.5	$ 1.3	$ 0.8	$ 1.7	$ 3.0	$ 5.3	$ 2.9	$ 10.5	4.3	21.7	14.7
Mobile Industries [Member]
Impairment and Restructuring Charges for the Mobile Segment
Impairment charges									0.0	3.9	0.1
Severance expense and related benefit costs									3.3	9.3	4.5
Exit costs									0.2	1.8	0.8
Total									3.5	15.0	5.4
Process Industries [Member]
Impairment and Restructuring Charges for the Mobile Segment
Impairment charges									0.1	0.0	3.2
Severance expense and related benefit costs									0.1	6.0	2.6
Exit costs									0.0	0.7	2.9
Total									0.2	6.7	8.7
Corporate Segment [Member]
Impairment and Restructuring Charges for the Mobile Segment
Impairment charges									0.0	0.0	0.0
Severance expense and related benefit costs									0.1	0.0	0.6
Exit costs									0.5	0.0	0.0
Total									$ 0.6	$ 0.0	$ 0.6