Environmental and Legal Contingencies (Details 3)		3 Months Ended
		Mar. 31, 2018 USD ($) claims-lawsuits defendants plaintiffs	Mar. 31, 2017 USD ($) claims-lawsuits
Asbestos Claims With Specific Dollar Claim For Damages [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending	[1]	144
Claims with specific dollar claims for damages [Abstract]
Asbestos Lawsuits Pending With Dollars Number Of Plaintiffs | plaintiffs		2,246
Asbestos Lawsuits Pending With Dollars Number Of Defendants | defendants		17,826
Asbestos Claims With Specific Dollar Claim For Damages [Member] | Asbestos Claims of Range 1 [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending		137
Claims with specific dollar claims for damages [Abstract]
Amount claimed per plaintiff, lower range | $		$ 0
Amount claimed per plaintiff, upper range | $		$ 200,000
Asbestos Claims With Specific Dollar Claim For Damages [Member] | Asbestos Claims of Range 2 [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending		4
Claims with specific dollar claims for damages [Abstract]
Amount claimed per plaintiff, lower range | $		$ 200,000
Amount claimed per plaintiff, upper range | $		$ 5,000,000
Asbestos Claims With Specific Dollar Claim For Damages [Member] | Asbestos Claims of Range 3 [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending		3
Claims with specific dollar claims for damages [Abstract]
Amount claimed per plaintiff, lower range | $		$ 5,000,000
Amount claimed per plaintiff, upper range | $		$ 20,000,000
Asbestos Claims Without Specific Dollar Claim For Damages [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending		193
Asbestos Issue [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending		337
Claims with specific dollar claims for damages [Abstract]
New Claims Filed		12	18
Pending Claims Disposed Of		11	11
Total Amount Paid in Settlements | $		$ 300,000	$ 100,000

[1] Involve a total of 2,246 plaintiffs and 17,826 defendants