Environmental and Legal Contingencies (Details 3)		3 Months Ended		6 Months Ended
		Jun. 30, 2018 USD ($) claims-lawsuits	Jun. 30, 2017 USD ($) claims-lawsuits	Jun. 30, 2018 USD ($) plaintiffs defendants claims-lawsuits	Jun. 30, 2017 USD ($) claims-lawsuits
Asbestos Claims With Specific Dollar Claim For Damages [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending	[1]	154		154
Claims with specific dollar claims for damages [Abstract]
Asbestos Lawsuits Pending With Dollars Number Of Plaintiffs | plaintiffs				2,256
Asbestos Lawsuits Pending With Dollars Number Of Defendants | defendants				18,466
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		147		147
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		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		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		173		173
Asbestos Issue [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending		327		327
Claims with specific dollar claims for damages [Abstract]
New Claims Filed		21	10	33	28
Pending Claims Disposed Of		31	13	42	24
Total Amount Paid in Settlements | $		$ 400,000	$ 500,000	$ 700,000	$ 600,000

[1] Involve a total of 2,256 plaintiffs and 18,466 defendants