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Derivative Financial Instruments and Hedging (Details2) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Asset $ 16.1 $ 4.3
Derivative Fair Value Of Derivative Liability 8.0 21.6
Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Asset 15.8 4.3
Derivative Fair Value Of Derivative Liability 7.8 19.9
Not Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Asset 0.3 0
Derivative Fair Value Of Derivative Liability 0.2 1.7
Prepaid expenses and other current assets | Nickel and other raw material contracts | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Asset 7.1 0.1
Prepaid expenses and other current assets | Natural gas contracts | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Asset 2.4 2.5
Prepaid expenses and other current assets | Electricity contracts | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Asset 0.1 0
Prepaid expenses and other current assets | Foreign exchange contracts | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Asset 0.2 0.3
Prepaid expenses and other current assets | Foreign exchange contracts | Not Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Asset 0.3 0
Other assets | Nickel and other raw material contracts | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Asset 5.4 0.4
Other assets | Natural gas contracts | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Asset 0.6 1.0
Accrued liabilities | Nickel and other raw material contracts | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Liability 0.1 4.5
Accrued liabilities | Natural gas contracts | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Liability 0.5 0.4
Accrued liabilities | Electricity contracts | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Liability 0.1 0.5
Accrued liabilities | Foreign exchange contracts | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Liability 4.2 7.8
Accrued liabilities | Foreign exchange contracts | Not Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Liability 0.2 1.7
Other long-term liabilities | Nickel and other raw material contracts | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Liability 0 1.3
Other long-term liabilities | Natural gas contracts | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Liability 1.2 0
Other long-term liabilities | Foreign exchange contracts | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Fair Value Of Derivative Liability $ 1.7 $ 5.4