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Inventories - Components of Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 293.9 | $ 279.8
Work in process | 14.4 | 12.6
Finished goods | 202.2 | 217.0
Supplies and materials | 255.9 | 253.1
Inventories | $ 766.4 | $ 762.5

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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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