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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Raw materials and work-in-progress $ 331.4 $ 163.3
Finished goods 90.0 33.8
Gross inventories 421.4 197.1
Inventory valuation reserves (24.8) (14.8)
Inventories, net $ 396.6 $ 182.3