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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 52.1 $ 48.8
In process 39.4 33.0
Finished products 138.8 124.7
Other 25.9 24.4
Total inventories $ 256.2 $ 230.9