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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 60.3 $ 48.8
In process 56.8 33.0
Finished products 161.3 124.7
Other 29.0 24.4
Total inventory $ 307.4 $ 230.9