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Business Combinations, Goodwill and Intangible Assets - Summary of Preliminary Fair Value of Assets Acquired and Liabilities Assumed as of Acquisition Date (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |  |
Intangible assets | $ 50.0 |  |
Goodwill | 39.3 |  | $ 18.8
Alcoa Warrick LLC [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Trade receivables | 160.0 | $ 162.4 |
Other receivables | 11.0 | 6.2 |
Inventories, including step up | 209.1 | 209.0 |
Prepaid expenses and other current assets | 0.3 |  |
Property, plant and equipment | 343.7 | 385.4 |
Operating lease assets | 12.3 | 12.3 |
Intangible assets | 50.0 | 56.5 |
Goodwill | 20.5 | 27.4 |
Other Assets | 56.8 |  |
Accounts payable | (143.2) | (143.0) |
Accrued salaries, wages and related expenses | (6.9) | (5.9) |
Other accrued liabilities | (10.6) | (11.5) |
Long-term portion of operating lease liabilities | (8.7) | (8.7) |
Pension and other postretirement benefits | (83.5) | (83.7) |
Long-term liabilities | (1.6) | (1.6) |
Preliminary allocated purchase consideration | 609.2 | $ 604.8 |
Alcoa Warrick LLC [Member] | Adjustments |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Trade receivables | (2.4) |  |
Other receivables | 4.8 |  |
Inventories, including step up | 0.1 |  |
Prepaid expenses and other current assets | 0.3 |  |
Property, plant and equipment | (41.7) |  |
Intangible assets | (6.5) |  |
Goodwill | (6.9) |  |
Other Assets | 56.8 |  |
Accounts payable | (0.2) |  |
Accrued salaries, wages and related expenses | (1.0) |  |
Other accrued liabilities | 0.9 |  |
Pension and other postretirement benefits | 0.2 |  |
Preliminary allocated purchase consideration | $ 4.4 |  |

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