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Derivative Financial Instruments and Hedging (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Derivative Instruments Gain Loss [Line Items]        
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net $ 2.6   $ 3.4  
Notional Amount of Derivatives, by Category of Derivative [Abstract]        
Percentage of estimated annual nickel requirements     7.00%  
Percentage of forecasted natural gas usage hedged for 2013     80.00%  
Percentage Of Forecasted Natural Gas Usage Hedged for 2014     75.00%  
Percentage Of Forecasted Natural Gas Usage Hedged for 2015     30.00%  
Percentage of on-peak and off-peak electricity hedged     10.00%  
Percentage of forecasted international sales hedged     10.00%  
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]        
Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months     (9.4)  
Other Comprehensive Income | Cash Flow Hedging
       
Derivative Instruments Gain Loss [Line Items]        
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net (11.1) 4.8 (12.9) 3.4
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 (2.6) (0.3) (3.4) (2.1)
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
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 0.2 4.8 (8.6) 0.1
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 (1.3) (1.5) (2.3) (2.3)
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
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 0.1 1.2 (0.2) (2.1)
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 (0.6) (1.8) (1.5) (6.8)
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
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 (0.1) 0.2 (0.1) (0.9)
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 (0.5) (0.2) (1.6)
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
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 (11.3) (1.4) (4.0) 6.3
Foreign exchange contracts | Cost Of Sales | Derivatives not designated as hedging instruments:
       
Derivative Instruments Gain Loss [Line Items]        
Derivative Instruments Gain Loss Recognized In Income Net (0.7) (1.9) (0.3) (2.0)
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 (0.7) 3.5 0.6 8.6
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