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Inventories
3 Months Ended
Mar. 31, 2018
Inventories [Abstract]  
Inventories
5.
Inventories

At March 31, 2018, and December 31, 2017, inventories included finished and in-process products totaling $322.6 million and $310.4 million, respectively, and raw materials and supplies of $145.4 million and $153.1 million, respectively.