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Derivative Financial Instruments and Hedging (Details) € in Millions, lb in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) lb | Mar. 31, 2018 USD ($) | Mar. 31, 2019 EUR (€)
Derivative Instruments Gain Loss [Line Items] |  |  |
Percentage of estimated annual nickel requirements | 14.00% |  |
Percentage Of Forecasted Natural Gas Usage Hedged for 2019 | 55.00% |  |
Percentage Of Forecasted Natural Gas Usage Hedged for 2020 | 40.00% |  |
Net derivatives gain on hedge transactions | $ 10.5 | $ 3.3 |
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract] |  |  |
Cash Flow Hedge Gain (Loss) To Be Reclassified Within Twelve Months | 2.9 |  |
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Net derivatives gain on hedge transactions | 8.0 | 2.5 |
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 | $ (0.7) |  |
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 |  | 2.3 |
Nickel |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional amount of nickel hedge (in pounds of nickel) | lb | 14 |  |
Interest Rate Swap | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Net derivatives gain on hedge transactions | $ (0.2) | 0.0 |
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 | (0.1) | 0.0 |
Nickel and other raw material contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Net derivatives gain on hedge transactions | 8.3 | 3.1 |
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 | (0.4) | 2.8 |
Natural gas contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Net derivatives gain on hedge transactions | (0.4) | 0.2 |
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 | 0.1 | (0.3) |
Foreign exchange contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Net derivatives gain on hedge transactions | 0.3 | (0.8) |
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 | (0.3) | (0.2) |
Designated as Hedging Instrument | Foreign exchange forward | Maturity Dates Through 2019 [Member] | Cash Flow Hedging |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional amount of derivative | € |  |  | € 33
Not Designated as Hedging Instrument | Foreign exchange forward | Maturity Dates Through 2019 [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional amount of derivative | € |  |  | € 7
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 | $ 0.1 | $ (0.2) |
2022 Term Loan |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.44% |  | 5.44%
2022 Term Loan | Interest Rate Swap |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional amount of derivative | $ 50.0 |  |

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- Definition Aggregate notional amount of price risk derivatives for instruments with notional amounts expressed in percentage of estimated annual domestic (U.S.) usage + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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