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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue Disaggregation
Revenue	$ 2,685.9	$ 2,974.5	$ 8,526.0	$ 8,720.5
Carbon steel
Revenue Disaggregation
Revenue	1,416.1	1,637.6	4,542.4	4,741.0
Aluminum
Revenue Disaggregation
Revenue	532.4	559.9	1,662.6	1,680.1
Stainless steel
Revenue Disaggregation
Revenue	388.7	418.7	1,202.4	1,250.6
Alloy
Revenue Disaggregation
Revenue	160.7	171.2	515.0	512.7
Toll processing and logistics
Revenue Disaggregation
Revenue	111.8	106.5	343.6	311.9
Other
Revenue Disaggregation
Revenue	$ 76.2	$ 80.6	$ 260.0	$ 224.2

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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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