Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue Disaggregation
Revenue	$ 17,025.0	$ 14,093.3	$ 8,811.9
Carbon steel
Revenue Disaggregation
Revenue	9,487.7	8,532.0	4,647.4
Stainless steel
Revenue Disaggregation
Revenue	2,877.4	2,267.0	1,435.6
Aluminum
Revenue Disaggregation
Revenue	2,658.7	2,050.9	1,687.6
Alloy
Revenue Disaggregation
Revenue	741.0	547.5	436.5
Toll processing and logistics
Revenue Disaggregation
Revenue	554.2	470.7	387.5
Copper and brass
Revenue Disaggregation
Revenue	336.7	112.2	50.5
Other and eliminations
Revenue Disaggregation
Revenue	$ 369.3	$ 113.0	$ 166.8