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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue Disaggregation
Revenues	$ 3,651.2	$ 3,420.3	$ 10,795.7	$ 10,708.4
Carbon steel
Revenue Disaggregation
Revenues	2,032.5	1,856.2	5,980.9	5,894.8
Aluminum
Revenue Disaggregation
Revenues	621.5	576.3	1,847.0	1,760.2
Stainless steel
Revenue Disaggregation
Revenues	489.9	513.9	1,482.3	1,595.6
Alloy
Revenue Disaggregation
Revenues	159.6	155.9	485.5	494.6
Toll processing and logistics
Revenue Disaggregation
Revenues	167.1	157.1	491.6	476.1
Copper and brass
Revenue Disaggregation
Revenues	102.6	78.4	283.2	240.7
Miscellaneous and eliminations
Revenue Disaggregation
Revenues	$ 78.0	$ 82.5	$ 225.2	$ 246.4

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