Annual report pursuant to Section 13 and 15(d)

STOCK COMPENSATION PLANS - Restricted Stock (Details)

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STOCK COMPENSATION PLANS - Restricted Stock (Details) - Restricted Stock Units (RSUs) - $ / shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding at beginning of year (in shares) 2,100,000 2,100,000 2,100,000
Outstanding at beginning of year, weighted average grant date fair value (in dollars per share) $ 10.31 $ 7.12 $ 9.10
Granted (in shares) 1,000,000.0 700,000 1,000,000.0
Granted, weighted average grant date fair value (in dollars per share) $ 19.41 $ 17.45 $ 4.87
Distributed (in shares) (600,000) (600,000) (1,100,000)
Distributed, weighted average grant date fair value (in dollars per share) $ 10.47 $ 7.31 $ 8.58
Forfeited/canceled (in shares) (100,000) (100,000) (100,000)
Forfeited/canceled, weighted average grant date fair value (in dollars per share) $ 17.82 $ 9.50 $ 7.31
Outstanding at end of year (in shares) 2,400,000 2,100,000 2,100,000
Outstanding at end of year, weighted average grant date fair value (in dollars per share) $ 13.66 $ 10.31 $ 7.12
Performance/vesting period 3 years    
AK Steel      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted (in shares) 0 0 200,000
Granted, weighted average grant date fair value (in dollars per share) $ 0 $ 0 $ 4.87