Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
EARNINGS PER SHARE (Earnings Per Share Computation) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   25.2   25.2
Antidilutive Incremental Common Shares Excluded and Attributable to Share-based Payment Arrangements 3.0 0.1   0.2
Income (Loss) from Continuing Operations $ (25.1) $ 49.9 $ 119.1 $ 178.5
Loss (Income) from Continuing Operations Attributable to Noncontrolling Interest 2.0 4.6 (23.5) (6.2)
Net Income (Loss) from Continuing Operations Attributable to Cliffs Shareholders (23.1) 54.5 95.6 172.3
Loss from Discontinued Operations, net of tax (2.7) (43.9) (0.6) (861.3)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS (25.8) 10.6 95.0 (689.0)
Preferred Stock Dividends 0.0 (25.6) 0.0 (38.4)
Net Income (Loss) Attributable to Cliffs Common Shareholders $ (25.8) $ (15.0) $ 95.0 $ (727.4)
Weighted Average Number of Shares:        
Basic 206.3 153.2 186.5 153.2
Employee Stock Plans 0.0 0.0 2.0 0.0
Diluted 206.3 153.2 188.5 153.2
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:        
Continuing operations (in dollars per share) $ (0.11) $ 0.19 $ 0.51 $ 0.87
Discontinued operations (in dollars per share) (0.01) (0.29) 0.00 (5.62)
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic (in dollars per share) (0.12) (0.10) 0.51 (4.75)
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:        
Continuing operations (in dollars per share) (0.11) 0.19 0.51 0.87
Discontinued operations (in dollars per share) (0.01) (0.29) 0.00 (5.62)
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted (in dollars per share) $ (0.12) $ (0.10) $ 0.51 $ (4.75)