Commitments And Contingencies (Schedule Of Settlement And Defense Costs) (Detail) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Document Period End Date			Sep. 30, 2017
Pre-tax cash payments			$ 46.8	$ 41.5
Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	32,075	36,450	32,075	36,450	36,052	31,980	38,664	41,090
Settlement / indemnity costs incurred (1)	$ 21.0	$ 9.6	$ 46.8	$ 25.3	$ 30.5
Defense costs incurred (1)	9.7	10.1	28.7	32.2	43.0
Gross Settlement And Defense Incurred Costs	30.7	19.7	75.5	57.5	73.5
Settlement / indemnity payments	13.9	14.4	37.3	28.0	32.4
Defense payments	9.5	10.6	28.7	31.0	43.7
Insurance receipts	(4.8)	(9.3)	(19.2)	(17.4)	(20.1)
Pre-tax cash payments	$ 18.6	$ 15.8	$ 46.8	$ 41.5	$ 56.0