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General Information (Unaudited) (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Apr. 30, 2021 | Mar. 31, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Proceeds from sale of receivables, gross |  | $ 52.5
Proceeds from sale of receivables, net |  | $ 52.4
PT Smelting | Subsequent event |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Business acquisition, percent of common stock acquired | 14.50% |
Payments to acquire additional interest in subsidiary | $ 33.0 |
PT Smelting |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Equity method investment, percentage ownership |  | 25.00%
PT Smelting | Subsequent event |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Equity method investment, percentage ownership | 39.50% |

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