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Customer Concentrations (Sales and Receivables to Significant Customers) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Concentration Risk [Line Items]
Sales and other operating revenue	$ 1,972.5	$ 1,456.0	$ 1,333.0
Cliffs Steel | Sales Revenue, Net | Customer Concentration Risk
Concentration Risk [Line Items]
Sales and other operating revenue	$ 1,182.8	$ 994.6
Percent of Company sales and other operating revenue	60.00%	68.30%
U.S. Steel | Sales Revenue, Net | Customer Concentration Risk
Concentration Risk [Line Items]
Sales and other operating revenue	$ 284.8	$ 210.0	$ 208.2
Percent of Company sales and other operating revenue	14.40%	14.40%	15.60%
Cliffs/AM USA | Sales Revenue, Net | Customer Concentration Risk
Concentration Risk [Line Items]
Sales and other operating revenue			$ 687.3
Percent of Company sales and other operating revenue			51.60%
Cliffs/AK Steel | Sales Revenue, Net | Customer Concentration Risk
Concentration Risk [Line Items]
Sales and other operating revenue			$ 355.8
Percent of Company sales and other operating revenue			26.70%

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