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

CAPITAL STOCK (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	May 01, 2015	Feb. 02, 2015	Nov. 03, 2014	Aug. 01, 2014	May 01, 2014	Dec. 01, 2014	Sep. 02, 2014	Jun. 03, 2014	Mar. 03, 2014
Class of Stock [Line Items]
Dividends, Preferred Stock	$ 12.8us-gaap_DividendsPreferredStock	$ 12.8us-gaap_DividendsPreferredStock
Elimination of Dividend	$ 0.15clf_EliminationofDividend
Free Cash Flow Due to Quarterly Dividend Elimination	92
Preferred Class A [Member]
Class of Stock [Line Items]
Dividends payable, per share			$ 17.50	$ 17.50	$ 17.50	$ 17.50	$ 17.50
Dividends, Preferred Stock	$ 12.8	$ 12.8
Common Stock [Member]
Class of Stock [Line Items]
Dividends payable, per share								$ 0.15	$ 0.150	$ 0.150	$ 0.150
Depositary Share [Member]
Class of Stock [Line Items]
Dividends payable, per share			$ 0.44	$ 0.44	$ 0.440	$ 0.440	$ 0.440