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Derivative Financial Instruments and Hedging - Narrative (Details)
€ in Millions, lb in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
lb
Dec. 31, 2020
EUR (€)
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Percentage of estimated annual nickel requirements   5.00%  
Derivative [Line Items]      
Tax expense for the recognition of a stranded deferred tax balance arising from deferred tax valuation allowances that was associated with a cash flow hedge portfolio $ 6.0    
Pre-tax cash flow hedge gain (loss) to be reclassified within twelve months   $ 2.5  
Nickel [Member]      
Derivative [Line Items]      
Derivative notional amount (in pounds of nickel) | lb   3  
Cash Flow Hedging [Member] | Natural gas contracts [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Percentage of forecasted natural gas usage hedged for 2022   25.00%  
Percentage Of Forecasted Natural Gas Usage Hedged for 2021   70.00%  
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Maturity Dates Through 2020 [Member]      
Derivative [Line Items]      
Derivative notional amount | €     € 0
Term Loan due 2024      
Derivative [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   4.21% 4.21%
Term Loan due 2024 | Interest Rate Swap [Member]      
Derivative [Line Items]      
Derivative notional amount   $ 50.0