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Annual report pursuant to Section 13 and 15(d)

STOCK COMPENSATION PLANS - Narrative (Details)

v3.22.0.1
STOCK COMPENSATION PLANS - Narrative (Details)
12 Months Ended
Mar. 13, 2020
shares
Dec. 31, 2021
shares
Dec. 31, 2020
shares
Dec. 31, 2019
shares
2021 Equity Plan Ìý Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Ìý Ìý Ìý Ìý
Number of additional shares authorized (in shares) Ìý 26,000,000 Ìý Ìý
Number of shares authorized (in shares) Ìý 28,000,000 Ìý Ìý
A&R 2015 Equity Plan Ìý Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Ìý Ìý Ìý Ìý
Number of shares authorized (in shares) Ìý 2,500,000 Ìý Ìý
AK Steel Ìý Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Ìý Ìý Ìý Ìý
Exchange ratio 0.400 Ìý Ìý Ìý
Stock options granted (in shares) 2,000,000 0 2,010,277 0
AK Steel | A&R 2015 Equity Plan Ìý Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Ìý Ìý Ìý Ìý
Number of additional shares authorized (in shares) 5,700,000 Ìý Ìý Ìý
Long-term Performance Plan | AK Steel Ìý Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Ìý Ìý Ìý Ìý
Granted (in shares) 1,000,000 Ìý Ìý Ìý
Performance Shares Ìý Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Ìý Ìý Ìý Ìý
Granted (in shares) Ìý 652,888 960,637 572,104
Performance Shares | AK Steel Ìý Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Ìý Ìý Ìý Ìý
Granted (in shares) 500,000 0 1,550,216 0
Restricted Stock | AK Steel Ìý Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Ìý Ìý Ìý Ìý
Granted (in shares) 200,000 Ìý Ìý Ìý
Restricted Stock Units (RSUs) Ìý Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Ìý Ìý Ìý Ìý
Granted (in shares) Ìý 678,420 960,637 572,104
Restricted Stock Units (RSUs) | AK Steel Ìý Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Ìý Ìý Ìý Ìý
Granted (in shares) 300,000 0 200,291 0