Impairment and Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2016
Restructuring and Related Cost [Line Items]
Tangible Asset Impairment Charges				$ 0.0			$ 0.0
Impairment and Restructuring Charges for the Mobile Segment
Severance Costs		$ 0.2		0.7		$ 0.4	1.9
Business Exit Costs		0.1		0.1		0.1	0.6
Total	$ 0.3	0.3	$ 0.8	0.8	$ 0.5	2.5	2.5
Mobile Industries [Member]
Restructuring and Related Cost [Line Items]
Tangible Asset Impairment Charges				0.0			0.0
Impairment and Restructuring Charges for the Mobile Segment
Severance Costs		0.0		0.6		0.2	1.8
Business Exit Costs		0.1		0.1		0.1	0.1
Total		0.1		0.7		0.3	1.9
Process Industries [Member]
Restructuring and Related Cost [Line Items]
Tangible Asset Impairment Charges				0.0			0.0
Impairment and Restructuring Charges for the Mobile Segment
Severance Costs		0.1		0.1		0.1	0.1
Business Exit Costs		0.0		0.0		0.0	0.0
Total		0.1		0.1		0.1	0.1
Corporate Segment [Member]
Restructuring and Related Cost [Line Items]
Tangible Asset Impairment Charges				0.0			0.0
Impairment and Restructuring Charges for the Mobile Segment
Severance Costs		0.1		0.0		0.1	0.0
Business Exit Costs		0.0		0.0		0.0	0.5
Total		$ 0.1		$ 0.0		$ 0.1	$ 0.5