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Quarterly report pursuant to Section 13 or 15(d)

CAPITAL STOCK (Details)

v2.4.1.9
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] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Dividends, Preferred Stock $ 12.8us-gaap_DividendsPreferredStock $ 12.8us-gaap_DividendsPreferredStock Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Elimination of Dividend $ 0.15clf_EliminationofDividend Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Free Cash Flow Due to Quarterly Dividend Elimination 92clf_FreeCashFlowDuetoQuarterlyDividendElimination Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Preferred Class A [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý 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
Ìý Ìý Ìý Ìý
Dividends, Preferred Stock $ 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 Ìý Ìý Ìý Ìý
Common Stock [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Dividends payable, per share Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 0.15us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 0.150us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 0.150us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 0.150us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Depositary Share [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý 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
Ìý Ìý Ìý Ìý