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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Inventory [Line Items]    
Raw materials and work-in-progress $ 388.1 $ 319.7
Finished goods 73.0 89.6
Gross inventories 461.1 409.3
Inventory valuation reserves (17.5) (17.3)
Inventories, net $ 443.6 $ 392.0