根据第13和15(d)条提交的年度报告

每股收益（每股收益计算）（详情）

v2.4.1.9
每股收益（每股收益计算）（详情）（美元）
以百万为单位，共享数据除外，除非另有说明
3个月结束 12个月结束
2014年12月31日
2014年9月30日
2014.6.30
2014年3月31日
2013年12月31日
2013年9月30日
2013年6月30日
2013年3月31日
2014年12月31日
2013年12月31日
2012年12月31日
从每股收益计算中排除的抗稀释证券，金额 25200000年us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount             12900000年us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 25200000年us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount    
归属于母公司的持续经营收入（亏损） 美元(1285。1)us-gaap_IncomeLossFromContinuingOperations 美元(5879 6)us-gaap_IncomeLossFromContinuingOperations 10.9美元us-gaap_IncomeLossFromContinuingOperations (70.3美元)us-gaap_IncomeLossFromContinuingOperations 43.3美元us-gaap_IncomeLossFromContinuingOperations 115.2美元us-gaap_IncomeLossFromContinuingOperations 146.0美元us-gaap_IncomeLossFromContinuingOperations 107.0美元us-gaap_IncomeLossFromContinuingOperations (7224美元。2)us-gaap_IncomeLossFromContinuingOperations 411.5美元us-gaap_IncomeLossFromContinuingOperations (935.3美元)us-gaap_IncomeLossFromContinuingOperations
终止经营的销售收入（亏损）和利得，扣除税款 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax     0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 2.0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 2.0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 35.9us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
归属于悬崖股东的净收入（亏损） (1285。1)us-gaap_NetIncomeLoss (5879 6)us-gaap_NetIncomeLoss 10.9us-gaap_NetIncomeLoss (70.3)us-gaap_NetIncomeLoss 43.3us-gaap_NetIncomeLoss 117.2us-gaap_NetIncomeLoss 146.0us-gaap_NetIncomeLoss 107.0us-gaap_NetIncomeLoss (7224。2)us-gaap_NetIncomeLoss 413.5us-gaap_NetIncomeLoss (899.4)us-gaap_NetIncomeLoss
优先股股息 (12.8)us-gaap_DividendsPreferredStock (12.8)us-gaap_DividendsPreferredStock (12.8)us-gaap_DividendsPreferredStock (12.8)us-gaap_DividendsPreferredStock         (51.2)us-gaap_DividendsPreferredStock (48.7)us-gaap_DividendsPreferredStock 0us-gaap_DividendsPreferredStock
归属于悬崖普通股股东的净收益（亏损） (1297。9)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (5892)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (1.9)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (83.1)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic         (7275)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 364.8us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (899.4)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
不包括并归属于基于股份的支付安排的抗稀释性增量普通股                 700000年clf_AntidilutiveIncrementalCommonSharesExcludedandAttributabletoSharebasedPaymentArrangements 0clf_AntidilutiveIncrementalCommonSharesExcludedandAttributabletoSharebasedPaymentArrangements 500000年clf_AntidilutiveIncrementalCommonSharesExcludedandAttributabletoSharebasedPaymentArrangements
加权平均股数：                      
基本                 153098000年us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 151726000年us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 142351000年us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
存托股票                 0clf_WeightedAverageNumberOfSharesOustandingDepositary 458000年clf_WeightedAverageNumberOfSharesOustandingDepositary 0clf_WeightedAverageNumberOfSharesOustandingDepositary
员工股票计划                 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 22139000年us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
稀释                 153098000年us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 174323000年us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 142351000年us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
每股普通股应归属于Cliffs普通股股东的收益（亏损）-基本：                      
持续经营 (8.48美元)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare (38.49美元)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare (0.01美元)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare (0.54美元)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare 0.20美元us-gaap_IncomeLossFromContinuingOperationsPerBasicShare 0.67美元us-gaap_IncomeLossFromContinuingOperationsPerBasicShare 0.87美元us-gaap_IncomeLossFromContinuingOperationsPerBasicShare 0.66美元us-gaap_IncomeLossFromContinuingOperationsPerBasicShare (47.52美元)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare 2.39美元us-gaap_IncomeLossFromContinuingOperationsPerBasicShare (6.57美元)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
已停止经营 0.00美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare 0.00美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare     0.00美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare 0.01美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare 0.00美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare 0.00美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare 0.00美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare 0.01美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare 0.25美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
每股普通股应归属于Cliffs普通股股东的收益（亏损）-基本： (8.48美元)us-gaap_EarningsPerShareBasic (38.49美元)us-gaap_EarningsPerShareBasic (0.01美元)us-gaap_EarningsPerShareBasic (0.54美元)us-gaap_EarningsPerShareBasic 0.20美元us-gaap_EarningsPerShareBasic 0.68美元us-gaap_EarningsPerShareBasic 0.87美元us-gaap_EarningsPerShareBasic 0.66美元us-gaap_EarningsPerShareBasic (47.52美元)us-gaap_EarningsPerShareBasic 2.40美元us-gaap_EarningsPerShareBasic (6.32美元)us-gaap_EarningsPerShareBasic
每股普通股应归属于Cliffs普通股股东的收益（亏损）-摊薄：                      
持续经营 (8.48美元)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare (38.49美元)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare (0.01美元)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare (0.54美元)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare 0.20美元us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare 0.65美元us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare 0.82美元us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare 0.66美元us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare (47.52美元)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare 2.36美元us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare (6.57美元)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
已停止经营 0.00美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare 0.00美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare     0.00美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare 0.01美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare 0.00美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare 0.00美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare 0.00美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare 0.01美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare 0.25美元us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
每股普通股应归属于Cliffs普通股股东的收益（亏损）-摊薄： (8.48美元)us-gaap_EarningsPerShareDiluted (38.49美元)us-gaap_EarningsPerShareDiluted (0.01美元)us-gaap_EarningsPerShareDiluted (0.54美元)us-gaap_EarningsPerShareDiluted 0.20美元us-gaap_EarningsPerShareDiluted 0.66美元us-gaap_EarningsPerShareDiluted 0.82美元us-gaap_EarningsPerShareDiluted 0.66美元us-gaap_EarningsPerShareDiluted (47.52美元)us-gaap_EarningsPerShareDiluted 2.37美元us-gaap_EarningsPerShareDiluted (6.32美元)us-gaap_EarningsPerShareDiluted
首选甲类〔会员〕                      
优先股股息 (12.8美元)us-gaap_DividendsPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember 		              (51.2美元)us-gaap_DividendsPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember