Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Earnings Per Share Computation) (Detail)

v2.4.0.6
Earnings Per Share (Earnings Per Share Computation) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Company Earnings Per Share [Line Items]        
Net income from continuing operations attributable to Cliffs shareholders $ 258.0 $ 409.8 $ 633.9 $ 833.6
Loss from discontinued operations   (0.7) (0.1) (1.1)
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS $ 258.0 $ 409.1 $ 633.8 $ 832.5
Weighted average number of shares:        
Basic 142,380,000 139,000,000 142,303,000 137,243,000
Employee stock plans 400,000 800,000 500,000 800,000
Diluted 142,814,000 139,783,000 142,762,000 137,987,000
Income (Loss) from Continuing Operations, Per Basic Share $ 1.81 $ 2.95 $ 4.45 $ 6.07
Income (Loss) from Discontinued Operations, Per Basic Share   $ (0.01)   $ (0.01)
Earnings per common share attributable to Cliffs shareholders - Basic $ 1.81 $ 2.94 $ 4.45 $ 6.06
Income (Loss) from Continuing Operations, Per Diluted Share $ 1.81 $ 2.93 $ 4.44 $ 6.04
Income (Loss) from Discontinued Operations, Per Diluted Share   $ (0.01)   $ (0.01)
Earnings per common share attributable to Cliffs shareholders - Diluted $ 1.81 $ 2.92 $ 4.44 $ 6.03