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Derivative Financial Instruments and Hedging (Details)
€ in Millions, lb in Millions, $ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
lb
Mar. 31, 2015
USD ($)
Mar. 31, 2016
EUR (€)
Derivative Instruments Gain Loss [Line Items]      
Percentage of estimated annual nickel requirements 32.00%    
Percentage Of Forecasted Natural Gas Usage Hedged for 2017 75.00%    
Percentage Of Forecasted Natural Gas Usage Hedged for 2018 20.00%    
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]      
Cash Flow Hedge Gain (Loss) To Be Reclassified Within Twelve Months $ (26.3)    
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging      
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net (5.7) $ 11.4  
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 (2.4) 1.7  
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 $ (0.7) 0.0  
Nickel      
Derivative Instruments Gain Loss [Line Items]      
Notional amount of nickel hedge (in pounds of nickel) | lb 30    
Nickel and other raw material contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging      
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net $ (3.4) (9.6)  
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 (3.9) (2.2)  
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 (Loss) [Member] | Cash Flow Hedging      
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net (2.0) (6.0)  
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 (3.2) (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 (0.7) 0.0  
Electricity contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging      
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net 0.0 0.0  
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)  
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 (Loss) [Member] | Cash Flow Hedging      
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net (0.3) 27.0  
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 4.7 6.4  
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  
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 (5.6) 5.5  
Designated as Hedging Instrument | Foreign exchange forward | Maturity Dates Through 2017 [Member] | Fair Value Hedging      
Derivative Instruments Gain Loss [Line Items]      
Notional amount of derivative | €     € 115.2
Designated as Hedging Instrument | Natural gas contracts | Cash Flow Hedging      
Derivative Instruments Gain Loss [Line Items]      
Loss on Cash Flow Hedge Ineffectiveness 1.1    
Not Designated as Hedging Instrument | Foreign exchange forward | Maturity Dates Through 2016      
Derivative Instruments Gain Loss [Line Items]      
Notional amount of derivative | €     € 20.0
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 $ (0.6) $ 3.5