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Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity and Comprehensive Income (Components of Comprehensive Income) (Details)

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Shareholders' Equity and Comprehensive Income (Components of Comprehensive Income) (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Shareholders' Equity and Comprehensive Income Ìý Ìý Ìý Ìý
Net income attributable to Cliffs shareholders $ 407.7 $ 260.7 $ 831.1 $ 338.1
Other comprehensive income: Ìý Ìý Ìý Ìý
Unrealized net gain (loss) on marketable securities - net of tax (19.0) (4.3) (19.2) (14.2)
Foreign currency translation 42.9 (73.4) 57.5 (44.3)
Amortization of net periodic benefit cost - net of tax 0.4 4.4 8.6 43.0
Reclassification of net gains on derivative financial instruments into net income (1.3) (1.6) (1.7) (3.2)
Unrealized gain on derivative financial instruments 3.0 Ìý 4.9 Ìý
Total other comprehensive income 26.0 (74.9) 50.1 (18.7)
Total comprehensive income $ 433.7 $ 185.8 $ 881.2 $ 319.4