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AOCI (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax $ 0.5 $ 0.4 $ 1.2 $ 2.9
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net (0.4)   (0.8)  
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax (0.1)   (0.4)  
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTaxAbstract        
OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicBenefitCostBeforeTax 3.8 3.0 7.6 5.9
Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax 33.5 30.0 67.0 59.9
Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax 11.4 10.4 22.9 20.7
Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax 18.3 16.6 36.5 33.3
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax (29.7)   (59.4)  
[NickelAndOtherRawMaterialContractsMember]
        
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax (1.6)   (1.5)  
[ForeignExchangeContractMember]
        
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax 0.9   2.1  
[NaturalGasContractsMember]
        
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax 0.2   (1.5)  
[ElectricityContractsMember]
        
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax $ 0   $ (0.3)