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Derivative Financial Instruments and Hedging (Details) € in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2015 EUR (€) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 EUR (€)
Notional Disclosures [Abstract] |  |  |  |  |  |  |
Percentage of estimated annual nickel requirements |  |  |  |  | 20.00% |  |
Percentage of forecasted natural gas usage hedged for 2015 |  |  |  |  | 80.00% |  |
Percentage Of Forecasted Natural Gas Usage Hedged for 2016 |  |  |  |  | 80.00% |  |
Percentage Of Forecasted Natural Gas Usage Hedged for 2017 |  |  |  |  | 50.00% |  |
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract] |  |  |  |  |  |  |
Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months |  |  |  |  | $ 2.2 |  |
Other Comprehensive Income | Cash Flow Hedging |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net | $ (6.4) |  |  | $ 7.9 | 5.0 | $ 13.6 |
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 |  |  | 0.3 | 3.0 | (1.0) |
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 | 0.0 |  |  | 0.0 | 0.0 | 0.0 |
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 | (3.5) |  |  | 7.1 | (13.1) | 10.1 |
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) |  |  | 0.9 | (4.6) | (0.8) |
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 | 0.2 |  |  | (1.0) | (5.8) | 1.3 |
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 | (2.4) |  |  | 1.0 | (4.8) | 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 |  |  | (0.1) | 0.0 | 0.8 |
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) | 0.5 |
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 | (3.1) |  |  | 1.9 | 23.9 | 1.4 |
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 | 6.1 |  |  | (1.7) | 12.5 | (3.1) |
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 | € |  |  | € 126.5 |  |  |  |
Cash proceeds from settlement of hedge |  | $ 26.1 |  |  |  |  |
Designated as Hedging Instrument | Foreign exchange forward | Cost Of Sales | Fair Value Hedging |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Gain on derivative | 1.9 |  |  |  | 7.4 |  |
Designated as Hedging Instrument | Foreign exchange forward | Maturity dates Through February 2018 |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Notional amount of derivative | € |  |  |  |  |  |  | € 334.0
Designated as Hedging Instrument | Foreign exchange forward | Maturity Dates Through 2015 |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Notional amount of derivative | € |  |  |  |  |  |  | 103.0
Designated as Hedging Instrument | Foreign exchange forward | Maturity Dates Through 2015 | Fair Value Hedging |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Notional amount of derivative | € |  |  | 115.0 |  |  |  | 69.0
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 February 2016 |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Notional amount of derivative | € |  |  |  |  |  |  | € 33.0
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 | $ (0.5) |  |  | $ 0.9 | $ 3.0 | $ 1.1 |

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