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Derivative Financial Instruments and Hedging - Narrative (Details)
€ in Millions, lb in Millions, $ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
lb
Dec. 31, 2015
EUR (€)
Dec. 31, 2015
USD ($)
Dec. 31, 2016
EUR (€)
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Maximum amount of time hedged for nickel requirements 2021      
Percentage of estimated annual nickel requirements 35.00%      
Derivative [Line Items]        
Cash flow hedge gain (loss) to be reclassified within twelve months $ (2.7)      
Nickel [Member]        
Derivative [Line Items]        
Derivative notional amount (in pounds of nickel) | lb 28      
Cash Flow Hedging [Member] | Natural gas contracts [Member] | Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Percentage of forecasted natural gas usage hedged for 2017 90.00%      
Percentage of forecasted natural gas usage hedged for 2018 25.00%      
Pre-tax loss on ineffective portion of hedge $ 1.3   $ 3.3  
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Derivative notional amount settled | €   € 211.9    
Proceeds from hedge     56.5  
Pre-tax gain on ineffective portion of hedge     14.3  
Fair Value Hedging [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Maturity Dates Through 2017 [Member]        
Derivative [Line Items]        
Derivative notional amount | €   139.2   € 43.2
Notional amount of derivatives entered during period | €   € 244.7    
Cost of Sales [Member] | Fair Value Hedging [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Gain (loss) on derivatives $ 1.0   $ 9.0