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Summary of Significant Accounting Policies - Warranty activity (Details) - Warranty Reserves
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Beginning balance $ 29.9
Amounts accrued 23.0
Warranties charged to accrual (13.6)
Ending balance $ 39.3