Quarterly report pursuant to Section 13 or 15(d)

Statements Of Condensed Consolidated Comprehensive Income

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Statements Of Condensed Consolidated Comprehensive Income (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]    
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS $ 107.0 $ 375.8
OTHER COMPREHENSIVE INCOME    
Pension and OPEB liability, net of tax 6.5 6.2
Unrealized net gain on marketable securities, net of tax 2.6 2.3
Unrealized net gain on foreign currency translation 3.3 10.9
Unrealized net gain (loss) on derivative financial instruments, net of tax (7.0) 3.8
OTHER COMPREHENSIVE INCOME 5.4 23.2
OTHER COMPREHENSIVE INCOME ATTRIBUTABLE TO THE NONCONTROLLING INTEREST (1.2) (1.5)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS $ 111.2 $ 397.5