Commitments and Contingencies (Schedule Of Settlement And Defense Costs) (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Loss Contingencies [Line Items]
Pre-tax cash payments				$ 29.6	$ 23.7
Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Settlement / indemnity costs incurred (1)	$ 10.6	$ 35.3	$ 2.8	24.5	18.6
Defense costs incurred (1)	3.8	15.6	3.5	11.2	11.6
Gross Settlement And Defense Incurred Costs	14.4	50.9	6.3	35.7	30.2
Settlement / indemnity payments	8.9	24.7	3.1	28.4	20.0
Defense payments	3.9	16.7	3.9	11.3	12.3
Insurance receipts	(3.4)	(10.3)	(2.4)	(10.1)	(8.6)
Pre-tax cash payments	$ 9.4	$ 31.1	$ 4.6	$ 29.6	$ 23.7