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Summary of Significant Accounting Policies - Warranty Activity (Details) - Warranty Reserves
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Beginning balance $ 44.2
Amounts accrued 5.8
Warranties charged to accrual (5.7)
Ending balance $ 44.3