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Annual report pursuant to Section 13 and 15(d)

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

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EARNINGS PER SHARE (Earnings Per Share Computation) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Income from continuing operations Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 294.5 $ 1,039.9 $ 360.6
Net Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 0.0 0.0 (3.9)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent $ 63.4 $ 91.8 $ 161.4 $ (22.1) $ 624.1 $ 199.8 $ 229.4 $ (13.4) 294.5 1,039.9 364.5
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent (0.2) (0.9) (0.6) 0.0 (14.6) 238.0 (64.3) (70.9) (1.7) 88.2 2.5
Net Income (Loss) Available to Common Stockholders, Basic $ 63.2 $ 90.9 $ 160.8 $ (22.1) $ 609.5 $ 437.8 $ 165.1 $ (84.3) $ 292.8 $ 1,128.1 $ 367.0
Weighted average number of shares: Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Basic Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 276,761 297,176 288,435
Convertible senior notes Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 4,400 3,400 0
Employee stock plans Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 3,300 3,500 4,600
Diluted Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 284,480 304,141 292,961
Earnings (loss) per common share attributable to Cliffs common shareholders - basic: Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Continuing operations $ 0.23 $ 0.34 $ 0.59 $ (0.08) $ 2.11 $ 0.67 $ 0.77 $ (0.05) $ 1.07 $ 3.50 $ 1.27
Discontinued operations 0 0 0 0 (0.05) 0.80 (0.22) (0.24) (0.01) 0.30 0.01
Earnings (loss) per common share attributable to Cliffs common shareholders - basic 0.23 0.34 0.59 (0.08) 2.06 1.47 0.55 (0.29) 1.06 3.80 1.28
Earnings (loss) per common share attributable to Cliffs common shareholders - diluted: Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Continuing operations 0.23 0.33 0.57 (0.08) 2.03 0.64 0.76 (0.05) 1.04 3.42 1.25
Discontinued operations 0 0 0 0 (0.05) 0.77 (0.21) (0.24) (0.01) 0.29 0.01
Earnings (loss) per common share attributable to Cliffs common shareholders - diluted $ 0.23 $ 0.33 $ 0.57 $ (0.08) $ 1.98 $ 1.41 $ 0.55 $ (0.29) $ 1.03 $ 3.71 $ 1.26