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Inventories (Components of Inventory) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Components of inventory    
Finished goods $ 173.7 $ 171.3
Work in process 49.8 43.9
Raw materials and supplies 80.0 67.6
LIFO reserve 1.3 0.0
Inventories, net $ 304.8 $ 282.8