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Accrued Liabilities (Schedule Of Accrued Liabilities) (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Accrued Liabilities Summary Of Warranty Liabilities [Abstract]      
Employee related expenses $ 118.9 $ 120.6  
Standard and Extended Product Warranty Accrual 11.0 11.0 $ 18.2
Current lease liabilities 23.3 24.0  
Contract with Customer, Liability, Current 79.0 88.4  
Other 129.5 134.2  
Total $ 361.7 $ 378.2