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Supplemental Balance Sheet Information - Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
LIFO    
Raw materials $ 46.3 $ 43.9
Work in process 32.6 32.2
Finished goods 67.4 73.5
Supplies and other 0.0 0.0
Inventory, gross 146.3 149.6
Excess of FIFO or weighted-average cost over LIFO cost (6.5) (7.5)
Inventories, net 139.8 142.1
Non- LIFO    
Raw materials 3.0 3.1
Work in process 0.1 0.1
Finished goods 16.0 16.9
Supplies and other 6.3 6.7
Inventory, gross 25.4 26.8
Inventories, net 25.4 26.8
Inventory, Net    
Raw materials 49.3 47.0
Work in process 32.7 32.3
Finished goods 83.4 90.4
Supplies and other 6.3 6.7
Inventory, gross 171.7 176.4
Excess of FIFO or weighted-average cost over LIFO cost (6.5) (7.5)
Inventory, net $ 165.2 $ 168.9