Commitments And Contingencies (Schedule Of Settlement And Defense Costs) (Detail) (USD $)	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011
Loss Contingencies [Line Items]
Pre-tax cash payments					$ (60,051,000)		$ (59,233,000)
Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Settlement / indemnity costs incurred (1)	8,400,000	[1]	12,000,000	[1]	29,300,000	[1]	42,100,000	[1]	50,200,000	[1]
Defense costs incurred (1)	15,300,000	[1]	14,700,000	[1]	44,200,000	[1]	40,800,000	[1]	55,300,000	[1]
Total costs incurred	23,800,000		26,700,000		73,500,000		82,900,000		105,500,000
Settlement / indemnity payments	9,800,000		20,200,000		27,800,000		41,700,000		55,000,000
Payments For Asbestos Related Defense And Related Fees Costs	13,900,000		14,000,000		41,900,000		41,400,000		56,500,000
Insurance receipts	(2,800,000)		(10,600,000)		(9,700,000)		(23,900,000)		(32,200,000)
Pre-tax cash payments	$ 20,800,000		$ 23,600,000		$ 60,100,000		$ 59,200,000		$ 79,300,000

[1] Before insurance recoveries and tax effects.