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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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- Definition

Proceeds from Sale and Collection of Receivables, Gross

+ References

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The cash outflow associated with the purchase of noncontrolling interest during the period.

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The cash inflow associated with the proceeds from sale and collection of receivables during the period.

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