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Derivative Financial Instruments and Hedging (Details) € in Millions, lb in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) lb | Sep. 30, 2015 USD ($) | Sep. 30, 2016 EUR (€)
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Percentage of estimated annual nickel requirements |  |  | 30.00% |  |
Percentage Of Forecasted Natural Gas Usage Hedged for 2017 |  |  | 90.00% |  |
Percentage Of Forecasted Natural Gas Usage Hedged for 2018 |  |  | 25.00% |  |
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract] |  |  |  |  |
Cash Flow Hedge Gain (Loss) To Be Reclassified Within Twelve Months |  |  | $ (9.3) |  |
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net | $ 3.0 | $ (16.5) | 13.6 | $ (11.5) |
Cost Of Sales | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net | (0.1) | 2.0 | (4.1) | 5.0 |
Selling And Administrative Expenses | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net | (0.3) | 0.0 | $ (1.2) | 0.0 |
Nickel |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Notional amount of nickel hedge (in pounds of nickel) | lb |  |  | 29 |  |
Nickel and other raw material contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net | 4.2 | (13.5) | $ 13.0 | (26.6) |
Nickel and other raw material contracts | Cost Of Sales | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net | (2.2) | (2.4) | (9.9) | (7.0) |
Nickel and other raw material contracts | Selling And Administrative Expenses | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net | 0.0 | 0.0 | 0.0 | 0.0 |
Natural gas contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net | (1.2) | (3.7) | 1.1 | (9.5) |
Natural gas contracts | Cost Of Sales | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net | (1.3) | (1.6) | (7.2) | (6.4) |
Natural gas contracts | Selling And Administrative Expenses | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net | (0.3) | 0.0 | (1.2) | 0.0 |
Electricity contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net | 0.0 | 0.0 | 0.0 | 0.0 |
Electricity contracts | Cost Of Sales | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net | 0.0 | 0.0 | 0.0 | (0.1) |
Electricity contracts | Selling And Administrative Expenses | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net | 0.0 | 0.0 | 0.0 | 0.0 |
Foreign exchange contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net | 0.0 | 0.7 | (0.5) | 24.6 |
Foreign exchange contracts | Cost Of Sales | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net | 3.4 | 6.0 | 13.0 | 18.5 |
Foreign exchange contracts | Selling And Administrative Expenses | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net | 0.0 | 0.0 | 0.0 | 0.0 |
Designated as Hedging Instrument | Foreign exchange forward | Cost Of Sales | Fair Value Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Income Net | (0.5) | (1.8) | (3.0) | 5.6 |
Designated as Hedging Instrument | Foreign exchange forward | Maturity Dates Through 2017 [Member] | Fair Value Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Notional amount of derivative | € |  |  |  |  | € 67.2
Designated as Hedging Instrument | Natural gas contracts | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Loss on Cash Flow Hedge Ineffectiveness | 0.4 |  | 1.7 |  |
Not Designated as Hedging Instrument | Foreign exchange forward | Maturity Dates Through 2017 [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Notional amount of derivative | € |  |  |  |  | € 10.0
Not Designated as Hedging Instrument | Foreign exchange contracts | Cost Of Sales |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Income Net | $ (0.2) | $ 0.0 | $ (0.1) | $ 3.0 |

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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 Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + 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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: 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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