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Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue Disaggregation
Revenue	$ 14,093.3	$ 8,811.9	$ 10,973.8
Carbon steel
Revenue Disaggregation
Revenue	8,532.0	4,647.4	5,792.9
Aluminum
Revenue Disaggregation
Revenue	2,050.9	1,687.6	2,151.9
Stainless steel
Revenue Disaggregation
Revenue	2,267.0	1,435.6	1,578.0
Alloy steel
Revenue Disaggregation
Revenue	547.5	436.5	652.1
Toll processing
Revenue Disaggregation
Revenue	470.7	387.5	450.7
Other.
Revenue Disaggregation
Revenue	$ 225.2	$ 217.3	$ 348.2

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