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Joint Ventures and Noncontrolling Interests (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |
Equity |  | $ 7,095.9 | $ 6,093.7 | $ 5,122.7 |  | $ 5,214.1
Feralloy Processing Company |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |
Equity | $ (5.5) |  |  |  |  |
Payments for acquired equity interest | 8.0 |  |  |  |  |
Carrying value of noncontrolling interest | 1.1 |  |  |  |  |
Increase to additional paid in capital for the direct tax effects resulting from the transaction | $ 1.4 |  |  |  |  |
Ownership percentage acquired | 49.00% |  |  |  |  |
Ownership percentage in consolidated investments other than equity method investment | 100.00% |  |  |  | 51.00% |
Indiana Pickling & Processing Company |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |
Ownership percentage in consolidated investments other than equity method investment |  | 56.00% |  |  |  |
Valex Corp. | South Korea |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |
Ownership percentage in consolidated investments other than equity method investment |  | 96.00% |  |  |  |
Minimum |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |
Ownership percentage of investee for accounting under the equity method of accounting |  | 20.00% |  |  |  |
Percentage of ownership for consolidation of financial statements |  | 50.00% |  |  |  |
Maximum |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |
Ownership percentage of investee for accounting under the equity method of accounting |  | 50.00% |  |  |  |

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