日韩三级片

Quarterly report pursuant to Section 13 or 15(d)

SHAREHOLDERS' EQUITY - Narrative (Details)

v3.20.2
SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Mar. 13, 2020
Dec. 31, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Apr. 24, 2019
Nov. 26, 2018
Class of Stock [Line Items]
Common shares, par value $ 0.125
Fair value of Cliffs common shares issued for AK Steel outstanding common stock $ 617.6
Stock Repurchase Program, Authorized Amount $ 100.0 $ 200.0
Stock Repurchased During Period, Shares 24,400,000
Payments for Repurchase of common shares $ 0.0 $ 252.9
Forecast [Member] | ArcelorMittal USA [Member] | Series B Participating Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Shares of Cliffs common shares issued to AK Steel stockholders 583,273
Preferred Class A [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized 3,000,000
Preferred Stock, Shares Outstanding 0
Preferred Stock, Shares Issued 0
Preferred Class B [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized 4,000,000
Preferred Stock, Shares Outstanding 0
Preferred Stock, Shares Issued 0
Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, Acquisitions 126,800,000 126,800,000
Stock Repurchased During Period, Shares 12,900,000 11,500,000