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Product Warranties (Details)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Movement in Standard Product Warranty Accrual  
Beginning balance standard product warrantyaccrual $ 11.6
Issued – warranty expense 3.3
Change in estimates (1.4)
Warranty usage (4.7)
Ending balance standard product warranty accrual $ 8.8