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Derivative Financial Instruments and Hedging (Details2) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | $ 58.1 | $ 59.9
Derivative Fair Value Of Derivative Liability | 42.2 | 27.0
Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 58.1 | 53.5
Derivative Fair Value Of Derivative Liability | 41.0 | 27.0
Not Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 0.0 | 6.4
Derivative Fair Value Of Derivative Liability | 1.2 | 0.0
Prepaid expenses and other current assets | Nickel and other raw material contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 0.0 | 1.1
Prepaid expenses and other current assets | Foreign exchange contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 25.2 | 23.6
Prepaid expenses and other current assets | Foreign exchange contracts | Not Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 0.0 | 6.4
Other assets | Nickel and other raw material contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 0.0 | 0.5
Other assets | Foreign exchange contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Asset | 32.9 | 28.3
Accrued liabilities | Nickel and other raw material contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Liability | 10.7 | 5.8
Accrued liabilities | Natural gas contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Liability | 10.9 | 10.2
Accrued liabilities | Electricity contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Liability | 0.0 | 0.1
Accrued liabilities | Foreign exchange contracts | Not Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Liability | 1.2 | 0.0
Other long-term liabilities | Nickel and other raw material contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Liability | 10.5 | 3.0
Other long-term liabilities | Natural gas contracts | Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Derivative Fair Value Of Derivative Liability | $ 8.9 | $ 7.9

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