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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventories [Abstract]    
Raw materials $ 82.5 $ 70.6
Work-in-process 7.9 5.4
Finished goods 92.3 80.5
Packaging and supplies 36.6 30.4
Total inventories $ 219.3 $ 186.9