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Inventories, Net - Schedule of Inventories Net (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Inventory Disclosure [Abstract] |  |
Finished products | $ 676.7 | $ 667.0
Products in process | 30.2 | 37.1
Raw materials | 61.4 | 35.3
Supplies and expendable parts | 148.6 | 149.9
Inventories, Gross | 916.9 | 889.3
Less: Allowances | (187.8) | (180.3)
Total | $ 729.1 | $ 709.0

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