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Revenue from Contracts with Customers - Disaggregated Sales and Other Operating Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	$ 520.4	$ 516.8	$ 1,542.6	$ 1,458.5
Cliffs Steel
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	338.7	302.7	1,000.8	861.4
U.S. Steel
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	79.2	75.2	230.4	209.8
Other
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	102.5	138.9	311.4	387.3
Cokemaking
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	481.3	468.5	1,418.5	1,319.4
Energy
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	12.5	17.3	36.5	49.0
Logistics
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	15.4	20.1	55.6	58.4
Operating and licensing fees
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	9.1	8.9	25.8	27.9
Other
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	$ 2.1	$ 2.0	$ 6.2	$ 3.8

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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.

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