Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
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-Section S99
-Paragraph 1
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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+ Details

Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Revenues (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue Disaggregation
Revenue	$ 3,420.3	$ 3,623.0	$ 10,708.4	$ 11,468.6
Carbon steel
Revenue Disaggregation
Revenue	1,856.2	1,996.9	5,894.8	6,266.6
Aluminum
Revenue Disaggregation
Revenue	576.3	592.6	1,760.2	1,902.5
Stainless steel
Revenue Disaggregation
Revenue	513.9	557.5	1,595.6	1,818.8
Alloy
Revenue Disaggregation
Revenue	155.9	174.4	494.6	552.6
Toll processing and logistics
Revenue Disaggregation
Revenue	157.1	154.3	476.1	464.2
Copper and brass
Revenue Disaggregation
Revenue	78.4	72.2	240.7	232.1
Other and eliminations
Revenue Disaggregation
Revenue	$ 82.5	$ 75.1	$ 246.4	$ 231.8