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EARNINGS PER SHARE (Earnings Per Share Computation) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Earnings Per Share [Abstract] |  |  |  |
Income (Loss) from Continuing Operations | $ 29.9 | $ (38.2) | $ 144.2 | $ 128.6
Income from Continuing Operations Attributable to Noncontrolling Interest | (16.7) | (5.0) | (25.5) | (3.1)
Net Income (Loss) from Continuing Operations Attributable to Cliffs Shareholders | 13.2 | (43.2) | 118.7 | 125.5
Income (Loss) from Discontinued Operations, net of tax | (0.4) | 103.4 | 2.1 | (825.1)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | 12.8 | 60.2 | 120.8 | (699.6)
Preferred Stock Dividends | 0.0 | 0.0 | 0.0 | (12.8)
Net Income (Loss) Attributable to Cliffs Common Shareholders | $ 12.8 | $ 60.2 | $ 120.8 | $ (712.4)
Weighted Average Number of Shares: |  |  |  |
Basic | 182,330 | 153,232 | 177,003 | 153,203
Depositary Shares | 0 | 0 | 0 | 25,200
Employee Stock Plans | 2,300 | 0 | 1,300 | 300
Diluted | 184,557 | 153,232 | 178,305 | 178,685
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic: |  |  |  |
Continuing operations (in dollars per share) | $ 0.07 | $ (0.28) | $ 0.67 | $ 0.74
Discontinued operations (in dollars per share) | 0.00 | 0.67 | 0.01 | (5.39)
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic (in dollars per share) | 0.07 | 0.39 | 0.68 | (4.65)
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted: |  |  |  |
Continuing operations (in dollars per share) | 0.07 | (0.28) | 0.67 | 0.70
Discontinued operations (in dollars per share) | 0.00 | 0.67 | 0.01 | (4.62)
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted (in dollars per share) | $ 0.07 | $ 0.39 | $ 0.68 | $ (3.92)

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