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Product Warranty (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Guarantees and Product Warranties [Abstract]      
Product warranty period, minimum, years 1 year    
Product warranty period, maximum, years 4 years    
Product warranty accrual, current $ 473.5 $ 431.6 $ 356.4
Product warranty accrual, noncurrent $ 95.2 $ 90.2 $ 82.0