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Quarterly report pursuant to Section 13 or 15(d)

CASH FLOW INFORMATION (Narrative) (Details)

v2.4.1.9
CASH FLOW INFORMATION (Narrative) (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
Dividends Payable [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Depositary Share Interest in a Share of 7% Series A Mandatory Convertible Preferred Stock, Class A 0.025clf_DepositaryShareInterestInShareOf7SeriesMandatoryConvertiblePreferredStockClassA Ìý Ìý Ìý Ìý Ìý Ìý
Preferred stock cash dividend $ 12.8us-gaap_DividendsPreferredStock $ 12.8us-gaap_DividendsPreferredStock Ìý Ìý Ìý Ìý Ìý
Preferred Class A [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Dividends Payable [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Dividends payable, per share Ìý Ìý $ 17.50us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
$ 17.50us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
$ 17.50us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
$ 17.50us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
$ 17.50us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
Preferred stock cash dividend $ 12.8us-gaap_DividendsPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
$ 12.8us-gaap_DividendsPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
Ìý Ìý Ìý Ìý Ìý
Depositary Share [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Dividends Payable [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Dividends payable, per share Ìý Ìý $ 0.44us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= clf_DepositarySharesMember
$ 0.44us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= clf_DepositarySharesMember
$ 0.440us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= clf_DepositarySharesMember
$ 0.440us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= clf_DepositarySharesMember
$ 0.440us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= clf_DepositarySharesMember