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Summary of Significant Accounting Policies - Warranty Activity (Details) - Warranty Reserves
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Beginning balance $ 36.4
Amounts accrued 7.9
Warranties charged to accrual (7.2)
Ending balance $ 37.1