Quarterly report pursuant to Section 13 or 15(d)

EARNINGS PER SHARE (Earnings Per Share Computation) (Details)

v3.19.1
EARNINGS PER SHARE (Earnings Per Share Computation) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]    
Loss from continuing operations $ (22.1) $ (13.4)
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX 0.0 (70.9)
NET INCOME (LOSS) $ (22.1) $ (84.3)
Weighted average number of shares:    
Basic 289,525 297,266
316.25 million 1.50% 2025 Convertible Senior Notes 0 0
Employee stock plans 0 0
Diluted 289,525 297,266
Loss per common share - basic:    
Continuing operations (in dollars per share) $ (0.08) $ (0.05)
Discontinued operations (in dollars per share) 0.00 (0.24)
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic (in dollars per share) (0.08) (0.29)
Loss per common share - diluted:    
Continuing operations (in dollars per share) (0.08) (0.05)
Discontinued operations (in dollars per share) 0.00 (0.24)
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted (in dollars per share) $ (0.08) $ (0.29)