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Inventories (Components of Inventory) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Components of inventory    
Finished goods $ 143.5 $ 131.4
Work in process 44.3 43.4
Raw materials and supplies 68.7 65.8
Inventories, net $ 256.5 $ 240.6