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Contingencies (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]      
Product Warranty Expense $ 2.6 $ 2.4  
Product Warranty Accrual, Current     $ 5.4
Standard and Extended Product Warranty Accrual, Decrease for Payments 2.1 0.9  
Standard Product Warranty Accrual $ 7.4 $ 6.9