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Derivative Financial Instruments and Hedging (Details) € in Millions, lb in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) lb | Sep. 30, 2019 USD ($) | Sep. 30, 2020 EUR (€)
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Percentage of estimated annual nickel requirements |  |  | 5.00% |  |
Percentage Of Forecasted Natural Gas Usage Hedged for 2020 |  |  | 100.00% |  |
Percentage Of Forecasted Natural Gas Usage Hedged for 2021 |  |  | 70.00% |  |
Percentage Of Forecasted Natural Gas Usage Hedged for 2022 |  |  | 25.00% |  |
Net derivatives gain (loss) on hedge transactions | $ 6.1 | $ 14.3 | $ (4.2) | $ 19.1 |
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract] |  |  |  |  |
Cash Flow Hedge Gain (Loss) To Be Reclassified Within Twelve Months |  |  | 1.7 |  |
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Net derivatives gain (loss) on hedge transactions | 4.7 | 10.6 | (3.1) | 14.3 |
Cost of Sales and Interest Expense [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net | (0.3) | 0.7 | $ (4.9) | (0.4) |
Nickel |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Notional amount of nickel hedge (in pounds of nickel) | lb |  |  | 3 |  |
Interest Rate Swap | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Net derivatives gain (loss) on hedge transactions | 0.1 | (1.2) | $ (2.1) | (1.7) |
Interest Rate Swap | Interest Expense [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net | (0.2) | (0.1) | (0.7) | (0.3) |
Nickel and other raw material contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Net derivatives gain (loss) on hedge transactions | 2.1 | 11.8 | (2.1) | 18.2 |
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 | 0.7 | 1.1 | (1.3) | 0.5 |
Natural gas contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Net derivatives gain (loss) on hedge transactions | 2.5 | (0.9) | 1.2 | (3.2) |
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 | (0.8) | (0.6) | (2.8) | (0.6) |
Foreign exchange contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Net derivatives gain (loss) on hedge transactions | 0.0 | 0.9 | (0.1) | 1.0 |
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 | $ 0.0 | $ 0.3 | $ (0.1) | $ 0.0 |
Designated as Hedging Instrument | Foreign exchange forward | Maturity Dates Through 2020 [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Notional amount of derivative | € |  |  |  |  | € 0
2024 Term Loan |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.21% |  | 4.21% |  | 4.21%
2024 Term Loan | Interest Rate Swap |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Notional amount of derivative | $ 50.0 |  | $ 50.0 |  |

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