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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Raw materials and work-in-progress $ 322.9 $ 163.3
Finished goods 86.4 33.8
Gross inventories 409.3 197.1
Inventory valuation reserves (24.8) (14.8)
Inventories, net $ 384.5 $ 182.3