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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue Disaggregation
Revenue	$ 3,847.4	$ 2,085.6	$ 10,104.6	$ 6,677.8
Carbon steel
Revenue Disaggregation
Revenue	2,406.4	1,100.8	6,163.7	3,490.8
Aluminum
Revenue Disaggregation
Revenue	534.9	394.3	1,496.5	1,299.9
Stainless steel
Revenue Disaggregation
Revenue	621.3	341.8	1,613.7	1,083.1
Alloy
Revenue Disaggregation
Revenue	143.8	91.0	396.0	342.3
Toll processing and logistics
Revenue Disaggregation
Revenue	119.7	105.7	350.9	279.6
Other and eliminations
Revenue Disaggregation
Revenue	$ 21.3	$ 52.0	$ 83.8	$ 182.1

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