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Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue Disaggregation
Revenue	$ 2,838.4	$ 2,572.9
Carbon steel
Revenue Disaggregation
Revenue	1,659.2	1,316.2
Aluminum
Revenue Disaggregation
Revenue	462.8	512.2
Stainless steel
Revenue Disaggregation
Revenue	452.9	404.9
Alloy
Revenue Disaggregation
Revenue	117.3	151.4
Toll processing and logistics
Revenue Disaggregation
Revenue	115.6	112.5
Other and eliminations
Revenue Disaggregation
Revenue	$ 30.6	$ 75.7

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