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Accrued Liabilities (Summary Of Warranty Liabilities) (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]      
Standard and Extended Product Warranty Accrual $ 11.9 $ 18.2 $ 14.6
Expense 6.1 14.6  
Product Warranty Accrual Changes From Business Acquisition Divestiture 0.0 1.1  
Payments / deductions (12.1) (12.0)  
Currency translation $ (0.3) $ (0.1)