Commitments And Contingencies (Schedule Of Activity Related To Asbestos Claim) (Detail) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) LegalMatter	Jun. 30, 2016	Jun. 30, 2017 USD ($) LegalMatter	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 22, 2016 USD ($)	Sep. 30, 2014 USD ($)	Jun. 16, 2014 USD ($)
Loss Contingencies [Line Items]
Airplane Operating Lease Period Years						five
Fair Value Of Residual Value Guarantee	$ 5.8		$ 5.8
Fair Value Of Residual Value Guarantee, Fair Value of Operating Lease Asset Threshold								$ 9.5
Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Beginning claims	35,560	40,649	36,052	41,090
New claims	684	662	1,502	1,642	2,826
Settlements	(327)	(147)	(628)	(541)	(924)
Dismissals	(3,937)	(2,500)	(4,946)	(3,527)	(6,940)
Ending claims	31,980	38,664	31,980	38,664	41,090
New York | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Ending claims | LegalMatter	18,300		18,300
Texas | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Ending claims | LegalMatter	800		800
Mississippi | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Ending claims | LegalMatter	1,500		1,500
OHIO | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Ending claims | LegalMatter	200		200
George Coulbourn [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court Judgment							$ 6.8
Ivan Sweberg [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court Judgment									$ 5.3
Court_Reduced_Verdict									10.0
Paid Judgment Pursuant to Appeal			$ 5.7
Selwyn Hackshaw [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court Judgment									3.1
Court_Reduced_Verdict									$ 6.0