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Derivative Financial Instruments and Hedging (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
[CostOfSalesMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[CostOfSalesMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[SellingAndAdministrativeExpensesMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[SellingAndAdministrativeExpensesMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[OtherComprehensiveIncomeMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[OtherComprehensiveIncomeMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[NickelAndOtherRawMaterialContractsMember]
[CostOfSalesMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[NickelAndOtherRawMaterialContractsMember]
[CostOfSalesMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[NickelAndOtherRawMaterialContractsMember]
[SellingAndAdministrativeExpensesMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[NickelAndOtherRawMaterialContractsMember]
[SellingAndAdministrativeExpensesMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[NickelAndOtherRawMaterialContractsMember]
[OtherComprehensiveIncomeMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[NickelAndOtherRawMaterialContractsMember]
[OtherComprehensiveIncomeMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[ForeignExchangeContractMember]
[CostOfSalesMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[ForeignExchangeContractMember]
[CostOfSalesMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[ForeignExchangeContractMember]
[CostOfSalesMember]
[NondesignatedMember]
Mar. 31, 2012
[ForeignExchangeContractMember]
[CostOfSalesMember]
[NondesignatedMember]
Mar. 31, 2013
[ForeignExchangeContractMember]
[SellingAndAdministrativeExpensesMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[ForeignExchangeContractMember]
[OtherComprehensiveIncomeMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[ForeignExchangeContractMember]
[OtherComprehensiveIncomeMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[NaturalGasContractsMember]
[CostOfSalesMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[NaturalGasContractsMember]
[CostOfSalesMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[NaturalGasContractsMember]
[SellingAndAdministrativeExpensesMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[NaturalGasContractsMember]
[SellingAndAdministrativeExpensesMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[NaturalGasContractsMember]
[OtherComprehensiveIncomeMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[NaturalGasContractsMember]
[OtherComprehensiveIncomeMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[ElectricityContractsMember]
[CostOfSalesMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[ElectricityContractsMember]
[CostOfSalesMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[ElectricityContractsMember]
[SellingAndAdministrativeExpensesMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[ElectricityContractsMember]
[SellingAndAdministrativeExpensesMember]
[CashFlowHedgingMember]
Mar. 31, 2013
[ElectricityContractsMember]
[OtherComprehensiveIncomeMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[ElectricityContractsMember]
[OtherComprehensiveIncomeMember]
[CashFlowHedgingMember]
Mar. 31, 2012
[InterestRateContractMember]
[SellingAndAdministrativeExpensesMember]
[CashFlowHedgingMember]
Derivative Instruments Gain Loss [Line Items]                                                                        
Derivative Instruments Gain Loss Recognized In Income Net                                     $ 0.8 $ (1.4)                                
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net                 8.0 (11.2)         (1.4) (1.6)           7.7 (4.1)         1.6 (4.5)         0.1 (1.0)  
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net (0.4)       (0.4) (1.5)         0.1 (0.1)         0.7 1.9           (1.0) (2.6)         (0.2) (0.7)          
Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net             0 0         0 0             0         0 0         0 0     0
Notional Amount Of Derivatives Total [Abstract]                                                                        
Percentage of estimated annual nickel requirements       10.00%                                                                
Percentage of forecasted natural gas usage hedged   5.00% 40.00% 70.00%                                                                
Percentage of on-peak and off-peak electricity hedged     10.00%                                                                  
Percentage of forecasted international sales hedged       10.00%                                                                
Reclassification Of Cash Flow Hedge Gain Loss [Abstract]                                                                        
Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months $ 3.1