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Summary of Significant Accounting Policies - Warranty Activity (Details) - Warranty Reserves
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Beginning balance $ 36.4
Amounts accrued 23.6
Warranties charged to accrual (18.8)
Ending balance $ 41.2