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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, 2015 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2015 EUR (€) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) lb | Sep. 30, 2015 EUR (€) lb | Sep. 30, 2014 USD ($)
Notional Disclosures [Abstract] |  |  |  |  |  |  |
Percentage of estimated annual nickel requirements |  |  |  |  | 25.00% | 25.00% |
Percentage of forecasted natural gas usage hedged for 2015 |  |  |  |  | 95.00% | 95.00% |
Percentage Of Forecasted Natural Gas Usage Hedged for 2016 |  |  |  |  | 90.00% | 90.00% |
Percentage Of Forecasted Natural Gas Usage Hedged for 2017 |  |  |  |  | 55.00% | 55.00% |
Percentage Of Forecasted Natural Gas Usage Hedged for 2018 |  |  |  |  | 15.00% | 15.00% |
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract] |  |  |  |  |  |  |
Cash Flow Hedge Gain (Loss) To Be Reclassified Within Twelve Months |  |  |  |  | $ (13.2) |  |
Other Comprehensive Income | Cash Flow Hedging |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net | $ (16.5) |  |  | $ 17.2 | (11.5) |  | $ 30.8
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 | 2.0 |  |  | 1.6 | 5.0 |  | 0.6
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
Nickel |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Notional amount of nickel hedge (in pounds of nickel) | lb |  |  |  |  | 27 | 27 |
Nickel and other raw material contracts | Other Comprehensive Income | Cash Flow Hedging |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net | (13.5) |  |  | (4.7) | $ (26.6) |  | 5.4
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 | (2.4) |  |  | 1.3 | (7.0) |  | 0.5
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 | Cash Flow Hedging |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net | (3.7) |  |  | (3.0) | (9.5) |  | (1.7)
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 | (1.6) |  |  | 0.0 | (6.4) |  | 2.4
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 | 0.0 |  |  | 0.0 | 0.0 |  | 0.0
Electricity contracts | Other Comprehensive Income | Cash Flow Hedging |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net | 0.0 |  |  | (0.2) | 0.0 |  | 0.6
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 |  |  | (0.1) | (0.1) |  | 0.4
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 | Cash Flow Hedging |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net | 0.7 |  |  | 25.1 | 24.6 |  | 26.5
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 | 6.0 |  |  | 0.4 | 18.5 |  | (2.7)
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 | Cash Flow Hedging |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Notional amount of derivatives net settled | € |  |  |  |  |  | € 222.5 |
Cash proceeds from settlement of hedge |  |  |  |  | 51.0 |  |
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 | (1.8) |  |  |  | 5.6 |  |
Designated as Hedging Instrument | Foreign exchange forward | Maturity dates Through 2018 |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Notional amount of derivative | € |  |  |  |  |  | 257.0 |
Designated as Hedging Instrument | Foreign exchange forward | Maturity Dates Through 2015 |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Notional amount of derivative | € |  |  |  |  |  | 54.0 |
Designated as Hedging Instrument | Foreign exchange forward | Maturity Dates Through 2016 | Fair Value Hedging |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Notional amount of derivative | € |  |  |  |  |  | 130.5 |
Derivative, Notional Amount, Contract Entered During Period | € |  |  |  |  |  | 211.0 |
Not Designated as Hedging Instrument | Foreign exchange forward |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Notional amount of derivatives net settled | € |  |  | € 40.3 |  |  |  |
Cash proceeds from settlement of hedge |  | $ 11.8 |  |  |  |  |
Not Designated as Hedging Instrument | Foreign exchange forward | Maturity Dates Through 2016 |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Notional amount of derivative | € |  |  | € 33.0 |  |  | € 32.0 |
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 | $ 0.0 |  |  | $ 3.1 | $ 3.0 |  | $ 4.2

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