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Accrued Liabilities (Summary Of Warranty Liabilities) (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]      
Standard and Extended Product Warranty Accrual $ 10.0 $ 11.0 $ 18.2
Expense 5.2 8.9  
Product Warranty Accrual Changes From Business Acquisition Divestiture 0.3 0.0  
Payments / deductions (6.5) (16.0)  
Currency translation $ 0.0 $ (0.1)