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Accrued Warranty Costs (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Changes in product warranty liability [Roll Forward]    
Beginning balance $ 6.4 $ 6.4
Claims paid (0.3) (0.2)
Warranty expense 0.4 0.6
Ending balance $ 6.5 $ 6.8