Commitments And Contingencies (Schedule Of Settlement And Defense Costs) (Detail) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Document Period End Date			Jun. 30, 2017
Pre-tax cash payments			$ 28.2	$ 25.7
Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	31,980	38,664	31,980	38,664	36,052	35,560	40,649	41,090
Settlement / indemnity costs incurred (1)	$ 7.3	$ 4.4	$ 25.8	$ 15.7	$ 30.5
Defense costs incurred (1)	9.5	12.1	19.0	22.1	43.0
Gross Settlement And Defense Incurred Costs	16.8	16.5	44.8	37.8	73.5
Settlement / indemnity payments	9.3	8.4	23.4	13.5	32.4
Defense payments	11.3	11.7	19.2	20.3	43.7
Insurance receipts	(7.1)	(5.2)	(14.4)	(8.1)	(20.1)
Pre-tax cash payments	$ 13.5	$ 14.9	$ 28.2	$ 25.7	$ 56.0