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Accrued Warranty Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Changes in product warranty liability [Roll Forward]        
Beginning balance $ 6.8 $ 6.7 $ 6.4 $ 6.2
Claims paid (0.4) (0.8) (0.6) (1.6)
Warranty expense 0.1 1.2 0.7 2.5
Ending balance $ 6.5 $ 7.1 $ 6.5 $ 7.1