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Annual report [Section 13 and 15(d), not S-K Item 405]

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

v3.25.0.1
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Nov. 01, 2024
$ / shares
shares
Dec. 31, 2024
USD ($)
employee
segment
Nov. 01, 2024
$ / shares
Dec. 31, 2023
USD ($)
Basis of Presentation and Significant Accounting Policies [Line Items] Ìý Ìý Ìý Ìý
Number of employees | employee Ìý 30,000 Ìý Ìý
Number of operating segments Ìý 4 Ìý Ìý
Number of reportable segments Ìý 1 Ìý Ìý
Stelco Holdings Inc Ìý Ìý Ìý Ìý
Basis of Presentation and Significant Accounting Policies [Line Items] Ìý Ìý Ìý Ìý
Share price (in dollars per share) | (per share) $ 60.00 Ìý $ 13.27 Ìý
Common stock per share | shares 25,862,021 Ìý Ìý Ìý
Business Acquisition, Shares Exchange Ratio 0.454 Ìý Ìý Ìý
Stelco Holdings Inc | Stelco Holdings Inc Ìý Ìý Ìý Ìý
Basis of Presentation and Significant Accounting Policies [Line Items] Ìý Ìý Ìý Ìý
Share price (in dollars per share) | $ / shares $ 60.00 Ìý Ìý Ìý
Other non-current assets Ìý Ìý Ìý Ìý
Basis of Presentation and Significant Accounting Policies [Line Items] Ìý Ìý Ìý Ìý
Investment in affiliates | $ Ìý $ 131 Ìý $ 123