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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Inventories [Abstract]    
Raw materials $ 91.9 $ 82.5
Work-in-process 12.0 7.9
Finished goods 97.0 92.3
Packaging and supplies 42.5 36.6
Total inventories $ 243.4 [1] $ 219.3 [2]
[1] Unaudited
[2] Condensed from audited financial statements