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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue Disaggregation
Revenue	$ 3,623.0	$ 4,247.2	$ 11,468.6	$ 13,414.2
Carbon steel
Revenue Disaggregation
Revenue	1,996.9	2,371.9	6,266.6	7,545.2
Aluminum
Revenue Disaggregation
Revenue	592.6	660.3	1,902.5	2,069.9
Stainless steel
Revenue Disaggregation
Revenue	557.5	712.7	1,818.8	2,284.7
Alloy
Revenue Disaggregation
Revenue	174.4	188.2	552.6	568.5
Toll processing and logistics
Revenue Disaggregation
Revenue	154.3	139.5	464.2	414.8
Copper and brass
Revenue Disaggregation
Revenue	72.2	81.0	232.1	260.4
Other and eliminations
Revenue Disaggregation
Revenue	$ 75.1	$ 93.6	$ 231.8	$ 270.7

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