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Business Combinations, Goodwill and Intangible Assets - Schedule of Preliminary Purchase Consideration (Details) - USD ($) $ in Millions |  |  | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2021
Business Acquisition [Line Items] |  |  |
Cash paid at acquisition close on March 31, 2021 |  |  | $ 617.5
Alcoa Warrick LLC [Member] |  |  |
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 |  |
Estimate of post-close adjustments | (8.0) |  |
Total preliminary purchase consideration to allocate | $ 609.5 |  |

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