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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue Disaggregation
Revenue	$ 2,085.6	$ 2,685.9	$ 6,677.8	$ 8,526.0
Carbon steel
Revenue Disaggregation
Revenue	1,100.8	1,416.1	3,490.8	4,542.4
Aluminum
Revenue Disaggregation
Revenue	394.3	532.4	1,299.9	1,662.6
Stainless steel
Revenue Disaggregation
Revenue	341.8	388.7	1,083.1	1,202.4
Alloy
Revenue Disaggregation
Revenue	91.0	160.7	342.3	515.0
Toll processing and logistics
Revenue Disaggregation
Revenue	105.7	111.8	279.6	343.6
Other and eliminations
Revenue Disaggregation
Revenue	$ 52.0	$ 76.2	$ 182.1	$ 260.0

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