Annual report pursuant to Section 13 and 15(d)

INCOME TAXES INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities by Location) (Details)

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Betfred
Dec. 31, 2014
Dec. 31, 2013
Income Tax Contingency [Line Items]    
Deferred Tax Liabilities, Net, Noncurrent $ 51.3us-gaap_DeferredTaxLiabilitiesNoncurrent $ 1,146.5us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred Tax Assets, Net 124.8us-gaap_DeferredTaxAssetsLiabilitiesNet (1,074.5)us-gaap_DeferredTaxAssetsLiabilitiesNet
Foreign [Member]    
Income Tax Contingency [Line Items]    
Income tax receivable 2.2us-gaap_DeferredTaxAssetsNetCurrent
/ clf_RegionReportingInformationByRegionAxis
= clf_ForeignMember
29.4us-gaap_DeferredTaxAssetsNetCurrent
/ clf_RegionReportingInformationByRegionAxis
= clf_ForeignMember
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 12.0us-gaap_DeferredTaxAssetsNetNoncurrent
/ clf_RegionReportingInformationByRegionAxis
= clf_ForeignMember
41.5us-gaap_DeferredTaxAssetsNetNoncurrent
/ clf_RegionReportingInformationByRegionAxis
= clf_ForeignMember
Deferred Tax Liabilities, Net, Noncurrent 51.3us-gaap_DeferredTaxLiabilitiesNoncurrent
/ clf_RegionReportingInformationByRegionAxis
= clf_ForeignMember
971.2us-gaap_DeferredTaxLiabilitiesNoncurrent
/ clf_RegionReportingInformationByRegionAxis
= clf_ForeignMember
Deferred Tax Liabilities, Net, Current 4.0us-gaap_DeferredTaxLiabilitiesCurrent
/ clf_RegionReportingInformationByRegionAxis
= clf_ForeignMember
6.1us-gaap_DeferredTaxLiabilitiesCurrent
/ clf_RegionReportingInformationByRegionAxis
= clf_ForeignMember
BetfredUnited States and Foreign [Member]    
Income Tax Contingency [Line Items]    
Deferred Tax Assets 180.1clf_DeferredTaxAssets
/ clf_RegionReportingInformationByRegionAxis
= clf_UnitedStatesAndForeignMember
78.1clf_DeferredTaxAssets
/ clf_RegionReportingInformationByRegionAxis
= clf_UnitedStatesAndForeignMember
Deferred Tax Liability 55.3clf_DeferredTaxLiability
/ clf_RegionReportingInformationByRegionAxis
= clf_UnitedStatesAndForeignMember
1,152.6clf_DeferredTaxLiability
/ clf_RegionReportingInformationByRegionAxis
= clf_UnitedStatesAndForeignMember
United States [Member]    
Income Tax Contingency [Line Items]    
Income tax receivable 165.9us-gaap_DeferredTaxAssetsNetCurrent
/ clf_RegionReportingInformationByRegionAxis
= clf_UnitedStatesMember
7.2us-gaap_DeferredTaxAssetsNetCurrent
/ clf_RegionReportingInformationByRegionAxis
= clf_UnitedStatesMember
Deferred Tax Liabilities, Net, Noncurrent $ 0us-gaap_DeferredTaxLiabilitiesNoncurrent
/ clf_RegionReportingInformationByRegionAxis
= clf_UnitedStatesMember
$ 175.3us-gaap_DeferredTaxLiabilitiesNoncurrent
/ clf_RegionReportingInformationByRegionAxis
= clf_UnitedStatesMember