Cleveland-Cliffs Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details)

Derivative Instruments and Hedging Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Derivatives designated as hedging instruments under ASC 815	$ 8.9	$ 2.8
Derivatives not designated as hedging instruments under ASC 815	115.4	81.8
Total derivatives	124.3	84.6
Derivative Assets (Current) [Member] \| Foreign Exchange Contract [Member]
Derivatives designated as hedging instruments under ASC 815	8.9	2.8
Derivatives not designated as hedging instruments under ASC 815	21.5	34.2
Derivative Assets (Current) [Member] \| Provisional Pricing Arrangements [Member]
Derivatives not designated as hedging instruments under ASC 815	15.8
Derivative Assets (Current) [Member] \| Customer Supply Agreements [Member]
Derivatives not designated as hedging instruments under ASC 815	64.0	45.6
Foreign Exchange Contract [Member] \| Deposits and Miscellaneous [Member]
Derivatives not designated as hedging instruments under ASC 815		2.0
Accounts Receivable [Member]
Total derivatives	14.1
Accounts Receivable [Member] \| Provisional Pricing Arrangements [Member]
Derivatives not designated as hedging instruments under ASC 815	$ 14.1

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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