Environmental and Legal Contingencies (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2011 claims-lawsuits		Dec. 31, 2010 claims-lawsuits
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending	402
Asbestos Claims [Member]
Claims with specific dollar claims for damages [Abstract]
Loss Contingency, New Claims Filed, Number	31		122
Loss Contingency, Claims Settled and Dismissed, Number	44		179
Amounts paid in asbestos settlements	$ 700,000		$ 800,000
Asbestos Claims With Specific Dollar Claim For Damages [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending	112	[1]
Claims with specific dollar claims for damages [Abstract]
Asbestos Lawsuits Pending With Dollars Number Of Plaintiffs	2,471
Asbestos Lawsuits Pending With Dollars Number Of Defendants	15,805
Asbestos Claims With Specific Dollar Claim For Damages [Member] | Asbestos claims of less than $0.2 [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending	102
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 $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 claims of $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 claims of $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	290

[1] Involve a total of 2,471 plaintiffs and 15,805 defendants