Commitments And Contingencies (Asbestos Liability Narrative) (Details)	3 Months Ended			12 Months Ended
	Sep. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($) Claim	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2017 USD ($)	Oct. 06, 2016 USD ($)	Sep. 30, 2016 USD ($)	Apr. 22, 2016 USD ($)	Feb. 09, 2016 USD ($)	Dec. 31, 2015	Jul. 02, 2015 USD ($)	Jun. 16, 2014 USD ($)	Sep. 17, 2013 USD ($)	Jul. 31, 2013 USD ($)	Mar. 01, 2013 USD ($)	Feb. 25, 2013 USD ($)	Oct. 23, 2012 USD ($)	Aug. 17, 2011 USD ($)	Feb. 23, 2011 USD ($)	Mar. 23, 2010 USD ($)
Loss Contingencies [Line Items]
Payments Or Receipts For Asbestos Related Fees And Costs Net Of Insurance Recoveries				$ 63,900,000	$ 62,500,000	$ 56,000,000
Current asbestos liability				$ 66,000,000	$ 85,000,000
Asbestos Commitments And Contingencies [Member]
Loss Contingencies [Line Items]
Pending claims			36,052	29,089	32,234	36,052						41,090
Gross Settlement And Defense Incurred Costs				$ 88,800,000	$ 88,300,000	$ 73,500,000
Payments Or Receipts For Asbestos Related Fees And Costs Net Of Insurance Recoveries				$ 63,900,000	62,500,000	56,000,000
Asbestos Cumulative Claims Resolved | Claim				136,000
Cumulative Related Settlement Cost Incurred Before Insurance Recoveries				$ 600,000,000
Cumulative Asbestos Settlement Cost Per Resolved Claim				4,400
Asbestos Settlement Cost Per Resolved Claim				11,300	$ 7,800	$ 3,900
Estimated Funds Available From Post Bankruptcy Trusts To Pay Current And Future Claimants				36,000,000,000
Increase In Total Asbestos Liability			$ 227,000,000
Mesothelioma Claims Percentage Pending Asbestos Claims			10.00%			10.00%
Mesothelioma Claims Percentage Aggregate Settlement Defense Costs			90.00%			90.00%
Asbestos Liability			$ 696,000,000	517,000,000		$ 696,000,000
Percentage Of Asbestos Liability Attributable To Settlement And Denfese Costs For Future Claims			80.00%			80.00%
Current asbestos liability				$ 66,000,000
Number of buyout agreements with excess insurer groups				10
Aggregate Value Of Policy Buy Out Agreements				$ 82,500,000
Estimated Percentage Of Insurance Which Covers Asbestos Costs			21.00%			21.00%
Insurance Receivable Asbestos			$ 143,000,000	$ 91,000,000		$ 143,000,000
Asbestos Commitments And Contingencies [Member] | James Nelson [Member]
Loss Contingencies [Line Items]
Jury Verdict																						$ 14,500,000
Court Judgment Against All Parties Held Responsible																					$ 4,000,000
Additional Judgment Interest																					$ 10,000
Share Of Responsibility Of Verdict																						9.09%
Asbestos Commitments And Contingencies [Member] | Ronald Dummitt [Member]
Loss Contingencies [Line Items]
Jury Verdict																				$ 32,000,000
Jury verdict percentage of responsibility.																				99.00%
Court written decision																				$ 8,000,000
Court Judgment																				$ 4,900,000
courtjudgmentwithinterest									$ 6,600,000
Asbestos Commitments And Contingencies [Member] | Gerald Suttner [Member]
Loss Contingencies [Line Items]
Court Judgment																			$ 100,000
courtjudgmentwithinterest			200,000			$ 200,000
Share Of Responsibility Of Verdict																			4.00%
Plaintiff's Damages																			$ 3,000,000
Asbestos Commitments And Contingencies [Member] | Thomas Amato [Member]
Loss Contingencies [Line Items]
Jury Verdict																		$ 2,500,000
Share Of Responsibility Of Verdict																		10.00%
PaidJuryVerdict	$ 300,000
Asbestos Commitments And Contingencies [Member] | Frank Vincinguerra [Member]
Loss Contingencies [Line Items]
Jury Verdict																		$ 2,300,000
Share Of Responsibility Of Verdict																		20.00%
PaidJuryVerdict			$ 600,000
Asbestos Commitments And Contingencies [Member] | Ivo Peraica [Member]
Loss Contingencies [Line Items]
Court Judgment																	$ 10,600,000
Reduced Damages								$ 4,250,000
CourtJudgmentIncludingSetoffs								1,940,000
Paid Judgment Pursuant to Appeal		$ 2,700,000
Jury Verdict Total																	35,000,000
Court_Reduced_Verdict																	$ 18,000,000
Asbestos Commitments And Contingencies [Member] | Holdsworth [Member]
Loss Contingencies [Line Items]
Court Judgment																$ 1,700,000
Jury Verdict Total																3,100,000
Motion to enter judgment																$ 1,000,000
Asbestos Commitments And Contingencies [Member] | Richard DeLisle [Member]
Loss Contingencies [Line Items]
Jury Verdict															$ 8,000,000
Court Judgment															$ 1,300,000
Share Of Responsibility Of Verdict															16.00%
Asbestos Commitments And Contingencies [Member] | Ivan Sweberg [Member]
Loss Contingencies [Line Items]
Court Judgment														$ 5,300,000
Reduced Damages								9,500,000
CourtJudgmentIncludingSetoffs								4,730,000
Paid Judgment Pursuant to Appeal		$ 5,700,000
Jury Verdict Total														15,000,000
Court_Reduced_Verdict														10,000,000
Asbestos Commitments And Contingencies [Member] | Selwyn Hackshaw [Member]
Loss Contingencies [Line Items]
Court Judgment														3,100,000
Reduced Damages								3,000,000
CourtJudgmentIncludingSetoffs								$ 0
Jury Verdict Total														10,000,000
Court_Reduced_Verdict														$ 6,000,000
Asbestos Commitments And Contingencies [Member] | James Poage [Member]
Loss Contingencies [Line Items]
Court Judgment													$ 10,800,000
compensatory_damages													1,500,000
Additional Damages													$ 10,000,000
Asbestos Commitments And Contingencies [Member] | Valent Rabovsky [Member]
Loss Contingencies [Line Items]
Court Judgment										$ 400,000
Share Of Responsibility Of Verdict											30.00%
Jury Verdict Total											$ 1,085,000
Asbestos Commitments And Contingencies [Member] | George Coulbourn [Member]
Loss Contingencies [Line Items]
Court Judgment										$ 6,800,000
Share Of Responsibility Of Verdict										20.00%
Jury Verdict Total										$ 9,000,000
Additional Damages										$ 5,000,000
Asbestos Commitments And Contingencies [Member] | Geoffrey_Anisansel [Member]
Loss Contingencies [Line Items]
Jury Verdict Total							$ 20,000,000
NEW YORK | Asbestos Commitments And Contingencies [Member]
Loss Contingencies [Line Items]
Pending claims | Claim				18,000
TEXAS | Asbestos Commitments And Contingencies [Member]
Loss Contingencies [Line Items]
Pending claims | Claim				100
MISSISSIPPI | Asbestos Commitments And Contingencies [Member]
Loss Contingencies [Line Items]
Pending claims | Claim				400
OHIO | Asbestos Commitments And Contingencies [Member]
Loss Contingencies [Line Items]
Pending claims | Claim				200