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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue Disaggregation
Revenue	$ 3,418.8	$ 2,019.3	$ 6,257.2	$ 4,592.2
Carbon steel
Revenue Disaggregation
Revenue	2,098.1	1,073.8	3,757.3	2,390.0
Aluminum
Revenue Disaggregation
Revenue	498.8	393.4	961.6	905.6
Stainless steel
Revenue Disaggregation
Revenue	539.5	336.4	992.4	741.3
Alloy
Revenue Disaggregation
Revenue	134.9	99.9	252.2	251.3
Toll processing and logistics
Revenue Disaggregation
Revenue	115.6	61.4	231.2	173.9
Other and eliminations
Revenue Disaggregation
Revenue	$ 31.9	$ 54.4	$ 62.5	$ 130.1

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