Environmental and Legal Contingencies (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2013 claims-lawsuits		Mar. 31, 2012 claims-lawsuits
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending	424
Asbestos Issue [Member]
Claims with specific dollar claims for damages [Abstract]
Loss Contingency, New Claims Filed, Number	11		14
Loss Contingency, Claims Settled and Dismissed, Number	20		7
Amounts paid in asbestos settlements	$ 700,000		$ 300,000
Asbestos Claims With Specific Dollar Claim For Damages [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending	122	[1]
Claims with specific dollar claims for damages [Abstract]
Asbestos Lawsuits Pending With Dollars Number Of Plaintiffs	2,283
Asbestos Lawsuits Pending With Dollars Number Of Defendants	17,025
Asbestos Claims With Specific Dollar Claim For Damages [Member] | Asbestos claims up to $0.2 [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending	112
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 above $0.2 to $5.0 [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending	6
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 above$5.0 to $15.0 [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending	2
Claims with specific dollar claims for damages [Abstract]
Amount claimed per plaintiff, lower range	5,000,000
Amount claimed per plaintiff, upper range	15,000,000
Asbestos Claims With Specific Dollar Claim For Damages [Member] | Asbestos above $15.0 to $20.0 [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending	2
Claims with specific dollar claims for damages [Abstract]
Amount claimed per plaintiff, lower range	15,000,000
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	302

[1] Involve a total of 2,283 plaintiffs and 17,025 defendants