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Derivative Financial Instruments and Hedging (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended				3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2013 [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2012 [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2013 [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2012 [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2013 [NickelAndOtherRawMaterialContractsMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [NickelAndOtherRawMaterialContractsMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [NickelAndOtherRawMaterialContractsMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [NickelAndOtherRawMaterialContractsMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [NickelAndOtherRawMaterialContractsMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [NickelAndOtherRawMaterialContractsMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [NickelAndOtherRawMaterialContractsMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [NickelAndOtherRawMaterialContractsMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [NickelAndOtherRawMaterialContractsMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2012 [NickelAndOtherRawMaterialContractsMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2013 [NickelAndOtherRawMaterialContractsMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2012 [NickelAndOtherRawMaterialContractsMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2013 [ForeignExchangeContractMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [ForeignExchangeContractMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [ForeignExchangeContractMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [ForeignExchangeContractMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [ForeignExchangeContractMember] [CostOfSalesMember] [NondesignatedMember]	Jun. 30, 2012 [ForeignExchangeContractMember] [CostOfSalesMember] [NondesignatedMember]	Jun. 30, 2013 [ForeignExchangeContractMember] [CostOfSalesMember] [NondesignatedMember]	Jun. 30, 2012 [ForeignExchangeContractMember] [CostOfSalesMember] [NondesignatedMember]	Jun. 30, 2013 [ForeignExchangeContractMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [ForeignExchangeContractMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [ForeignExchangeContractMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [ForeignExchangeContractMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [ForeignExchangeContractMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2012 [ForeignExchangeContractMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2013 [ForeignExchangeContractMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2012 [ForeignExchangeContractMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2013 [NaturalGasContractsMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [NaturalGasContractsMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [NaturalGasContractsMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [NaturalGasContractsMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [NaturalGasContractsMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [NaturalGasContractsMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [NaturalGasContractsMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [NaturalGasContractsMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [NaturalGasContractsMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2012 [NaturalGasContractsMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2013 [NaturalGasContractsMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2012 [NaturalGasContractsMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2013 [ElectricityContractsMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [ElectricityContractsMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [ElectricityContractsMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [ElectricityContractsMember] [CostOfSalesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [ElectricityContractsMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [ElectricityContractsMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [ElectricityContractsMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2012 [ElectricityContractsMember] [SellingAndAdministrativeExpensesMember] [CashFlowHedgingMember]	Jun. 30, 2013 [ElectricityContractsMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2012 [ElectricityContractsMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2013 [ElectricityContractsMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]	Jun. 30, 2012 [ElectricityContractsMember] [OtherComprehensiveIncomeMember] [CashFlowHedgingMember]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Gain Loss Recognized In Income Net																																			$ (0.4)	$ 1.3	$ 0.4	$ (0.1)
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net															(9.8)	9.8	(1.8)	(1.4)									(7.4)	(3.1)	(8.8)	(4.7)													(0.4)	11.8	7.3	7.7									(1.9)	1.2	(0.3)	(3.3)									(0.1)	(0.1)	0	(1.1)
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net	(0.4)	(0.8)					(0.4)	(0.3)	(0.8)	(1.8)									(1.1)	(0.7)	(1.0)	(0.8)									0.6	3.2	1.3	5.1													0.1	(2.4)	(0.9)	(5.0)									0	(0.4)	(0.2)	(1.1)
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	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%	50.00%	65.00%
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		$ (5.6)

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- Definition

Aggregate notional amount of price risk derivatives for instruments with notional amounts expressed in percentage of annual forecasted requirements for on-peak electricity usage

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- Definition

Aggregate notional amount of foreign currency derivatives for instruments with notional amounts expressed in percentage of annual forecasted international sales

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Aggregate notional amount of price risk derivatives for instruments with notional amounts expressed in percentage of estimated annual domestic (U.S.) usage

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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