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Business Combinations, Goodwill and Intangible Assets - Summary of Preliminary Fair Value of Assets Acquired and Liabilities Assumed at Acquisition Date (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Finite Lived Intangible Assets [Line Items] |  |
Intangible assets | $ 56.5 |
Goodwill | 46.2 | $ 18.8
Alcoa Warrick LLC [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Trade receivables | 162.4 |
Other receivables | 6.2 |
Inventories, including step up | 209.0 |
Property, plant and equipment | 385.4 |
Operating lease assets | 12.3 |
Intangible assets | 56.5 |
Goodwill | 27.4 |
Accounts payable | (143.0) |
Accrued salaries, wages and related expenses | (5.9) |
Other accrued liabilities | (11.5) |
Long-term portion of operating lease liabilities | (8.7) |
Pension and other postretirement benefits | 83.7 |
Long-term liabilities | (1.6) |
Preliminary allocated purchase consideration | $ 604.8 |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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