Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTIES (Summary Of Ownership Interests) (Details)

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Mar. 31, 2020
Related Party Transaction [Line Items]  
Equity Method Investment, Ownership Percentage 23.00%
Arcelor Mittal [Member]  
Related Party Transaction [Line Items]  
Equity Method Investment, Ownership Percentage 62.30%
betfred sportsbook reviewU. S. Steel Canada [Member]  
Related Party Transaction [Line Items]  
Equity Method Investment, Ownership Percentage 14.70%