Quarterly report pursuant to Section 13 or 15(d)

EARNINGS PER SHARE - Earnings Per Share Computation (Details)

v3.20.2
EARNINGS PER SHARE - Earnings Per Share Computation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]        
Income (loss) from continuing operations $ 2.2 $ 91.8 $ (154.8) $ 231.1
Income attributable to noncontrolling interest (11.9) 0.0 (31.2) 0.0
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (9.7) 91.8 (186.0) 231.1
Loss from discontinued operations, net of tax (0.3) (0.9) 0.0 (1.5)
Net income (loss) attributable to Cliffs shareholders $ (10.0) $ 90.9 $ (186.0) $ 229.6
Weighted average number of shares:        
Basic 399,399 269,960 365,245 278,418
Convertible Senior Notes 0 3,700 0 5,800
Employee stock plans 0 2,900 0 3,600
Diluted 399,399 276,578 365,245 287,755
Earnings (loss) per common share attributable to Cliffs shareholders - basic:        
Continuing operations (in dollars per share) $ (0.02) $ 0.34 $ (0.51) $ 0.83
Discontinued operations (in dollars per share) 0 0 0 (0.01)
Earnings (Loss) per Common Share - Basic (in dollars per share) (0.02) 0.34 (0.51) 0.82
Earnings (loss) per common share attributable to Cliffs shareholders - diluted:        
Continuing operations (in dollars per share) (0.02) 0.33 (0.51) 0.80
Discontinued operations (in dollars per share) 0 0 0 0
Earnings (Loss) per Common Share - Diluted (in dollars per share) $ (0.02) $ 0.33 $ (0.51) $ 0.80