Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity And Comprehensive Income (Changes In Comprehensive Income) (Details)

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Shareholders' Equity And Comprehensive Income (Changes In Comprehensive Income) (Details) (USD $)
In Millions
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Beginning Balance     $ 3,845.9  
Beginning Balance     (7.2)  
Beginning Balance     3,838.7  
Net income 589.5 297.4 1,420.6 635.4
Net income 151.8   170.1  
Net income 741.3 297.4 1,590.7 635.4
Total comprehensive income 434.3 457.2 1,315.4 776.5
Share buyback     221.9  
Ending Balance 5,723.4   5,723.4  
Ending Balance 1,128.4   1,128.4  
Ending Balance 6,851.8   6,851.8  
Cliffs Shareholders' Equity [Member]
       
Beginning Balance     3,845.9  
Net income     1,420.6  
Other comprehensive income     (105.2)  
Total comprehensive income     1,315.4  
Share buyback     (221.9)  
Equity offering     853.7  
Purchase of additional noncontrolling interest     0.3  
Stock and other incentive plans     8.8  
Common stock dividends     (78.8)  
Ending Balance 5,723.4   5,723.4  
Non- Controlling Interest [Member]
       
Beginning Balance     (7.2)  
Net income     170.1  
Other comprehensive income     0.5  
Total comprehensive income     170.6  
Purchase of subsidiary shares from noncontrolling interest     4.5  
Undistributed gains to noncontrolling interest     12.6  
Capital contribution by noncontrolling interest to subsidiary     0.3  
Acquisition of controlling interest     947.6  
Ending Balance 1,128.4   1,128.4  
Total Comprehensive Income [Member]
       
Beginning Balance     3,838.7  
Net income     1,590.7  
Other comprehensive income     (104.7)  
Total comprehensive income     1,486.0  
Share buyback     (221.9)  
Equity offering     853.7  
Purchase of additional noncontrolling interest     0.3  
Stock and other incentive plans     8.8  
Common stock dividends     (78.8)  
Purchase of subsidiary shares from noncontrolling interest     4.5  
Undistributed gains to noncontrolling interest     12.6  
Capital contribution by noncontrolling interest to subsidiary     0.3  
Acquisition of controlling interest     947.6  
Ending Balance $ 6,851.8   $ 6,851.8