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Business Combinations, Goodwill and Intangible Assets - Schedule of Preliminary Purchase Consideration (Details) - Alcoa Warrick LLC [Member] - USD ($) $ in Millions | Sep. 30, 2021 | Mar. 31, 2021
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Business Acquisition [Line Items] |  |
Contract purchase price | $ 670.0 | $ 670.0
Preliminary working capital adjustment | 31.0 |
Initial outstanding indebtedness – Other postretirement benefits liabilities | (83.5) |
Cash paid at acquisition close on March 31, 2021 | 617.5 |
Cash received for post-close adjustments | (8.3) |
Total purchase consideration to allocate | $ 609.2 |

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