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Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue Disaggregation
Revenue	$ 4,485.8	$ 2,838.4
Carbon steel
Revenue Disaggregation
Revenue	2,547.5	1,659.2
Aluminum
Revenue Disaggregation
Revenue	692.8	462.8
Stainless steel
Revenue Disaggregation
Revenue	764.9	452.9
Alloy steel
Revenue Disaggregation
Revenue	183.7	117.3
Toll processing
Revenue Disaggregation
Revenue	135.1	115.6
Other.
Revenue Disaggregation
Revenue	$ 161.8	$ 30.6

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