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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
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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] 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[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 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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 + References No definition available. + Details
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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 + References No definition available. + Details
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- Definition Aggregate notional amount of price risk derivatives for instruments with notional amounts expressed in percentage of estimated annual domestic (U.S.) usage + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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