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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Inventories:    
Finished goods $ 430.4 $ 349.6
Work in process 518.8 508.1
Raw materials, supplies and other 206.9 211.9
FIFO inventory 1,156.1 1,069.6
Less: Excess of FIFO cost over LIFO cost (130.6) (126.8)
Net inventories $ 1,025.5 $ 942.8
Percentage of LIFO Inventory 25.00% 22.00%