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Inventories, net (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Inventory, Net    
Raw materials $ 49.8 $ 42.6
Production materials, stores and supplies 23.7 22.3
Finished and in-process goods 163.5 158.0
Subtotal 237.0 222.9
Less: adjustment of inventories to LIFO basis (13.5) (10.4)
Inventories, net $ 223.5 $ 212.5