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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Inventory [Line Items]    
Raw materials and work-in-progress $ 381.0 $ 375.1
Finished goods 89.0 99.0
Gross inventories 470.0 474.1
Inventory valuation reserves (17.5) (14.4)
Inventories, net $ 452.5 $ 459.7