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Commitments and Contingencies (Schedule Of Settlement And Defense Costs) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Loss Contingencies [Line Items]      
Pre-tax cash payments, net   $ 0.0 $ 29.3
Asbestos Commitments and Contingencies      
Loss Contingencies [Line Items]      
Settlement / indemnity costs incurred $ 6.3   29.4
Defense costs incurred 1.0   6.4
Total costs incurred 7.3   35.8
Settlement / indemnity payments 6.6   33.8
Defense payments 1.1   6.1
Insurance receipts (1.8)   (10.6)
Pre-tax cash payments, net $ 5.9   $ 29.3