Annual report pursuant to Section 13 and 15(d)

STOCK COMPENSATION PLANS - Performance Shares (Details)

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STOCK COMPENSATION PLANS - Performance Shares (Details) - $ / shares
12 Months Ended
Mar. 13, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Performance Shares        
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)   2,452,226 1,935,878 1,424,723
Outstanding at beginning of year, weighted average grant date fair value (in dollars per share)   $ 10.34 $ 15.58 $ 14.46
Granted (in shares)   652,888 960,637 572,104
Granted, weighted average grant date fair value (in dollars per share)   $ 25.12 $ 6.93 $ 18.31
Distributed (in shares)   (1,279,509) (1,938,786) 0
Distributed, weighted average grant date fair value (in dollars per share)   $ 11.74 $ 12.23 $ 0
Performance adjustment (in shares)   625,355 549,154 0
Performance adjustment, weighted average grant date fair value (in dollars per share)   $ 11.93 $ 15.63 $ 0
Forfeited/canceled (in shares)   (80,490) (604,873) (60,949)
Forfeited/canceled, weighted average grant date fair value (in dollars per share)   $ 11.27 $ 5.70 $ 15.12
Outstanding at end of year (in shares)   2,370,470 2,452,226 1,935,878
Outstanding at end of year, weighted average grant date fair value (in dollars per share)   $ 14.04 $ 10.34 $ 15.58
Performance/vesting period   3 years    
Performance Shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Percent of shares actually earned based on performance   0.00%    
Performance Shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Percent of shares actually earned based on performance   200.00%    
Performance Shares | 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) 500,000 0 1,550,216 0
Granted, weighted average grant date fair value (in dollars per share)   $ 0 $ 4.59 $ 0
Outstanding at end of year (in shares)   100,000    
Long-term Performance Plan | 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) 1,000,000      
Outstanding at end of year (in shares)   200,000