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Inventories, Net - Schedule of Inventories Net (Detail) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Inventory Disclosure [Abstract] |  |
Finished products | $ 661.4 | $ 667.0
Products in process | 26.2 | 37.1
Raw materials | 37.9 | 35.3
Supplies and expendable parts | 151.1 | 149.9
Inventories, Gross | 876.6 | 889.3
Less: Allowances | (186.6) | (180.3)
Total | $ 690.0 | $ 709.0

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