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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, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) lb | Sep. 30, 2017 USD ($) | Sep. 30, 2018 EUR (€) | Jul. 31, 2018 USD ($)
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Percentage of estimated annual nickel requirements |  |  | 12.00% |  |  |
Percentage Of Forecasted Natural Gas Usage Hedged for 2018 |  |  | 35.00% |  |  |
Percentage Of Forecasted Natural Gas Usage Hedged for 2019 |  |  | 35.00% |  |  |
Percentage of Forecasted Natural Gas Usage Hedged for 2020 |  |  | 30.00% |  |  |
Net derivatives gain (loss) on hedge transactions | $ (10.8) | $ 9.2 | $ 2.4 | $ (1.6) |  |
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract] |  |  |  |  |  |
Cash Flow Hedge Gain (Loss) To Be Reclassified Within Twelve Months |  |  | 1.6 |  |  |
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Net derivatives gain (loss) on hedge transactions | (8.1) | 5.7 | 1.9 | (1.0) |  |
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 | 2.0 |  | $ 7.8 |  |  |
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 |  | 2.2 |  |
Nickel |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Notional amount of nickel hedge (in pounds of nickel) | lb |  |  | 12 |  |  |
Interest Rate Swap | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Net derivatives gain (loss) on hedge transactions | (0.2) | 0.0 | $ (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 | (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 (loss) on hedge transactions | (8.0) | 5.6 | 1.3 | 1.2 |  |
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 | 1.7 | (0.9) | 7.9 | (2.5) |  |
Natural gas contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Net derivatives gain (loss) on hedge transactions | (0.1) | 0.0 | 0.1 | (2.1) |  |
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 | 0.0 | (0.7) | (0.4) | (2.8) |  |
Foreign exchange contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Net derivatives gain (loss) on hedge transactions | 0.2 | 0.1 | 0.7 | (0.1) |  |
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 | 0.4 | 2.4 | 0.4 | 7.5 |  |
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 | € |  |  |  |  | € 16 |
Not Designated as Hedging Instrument | Foreign exchange forward | Maturity Dates Through 2019 [Member] |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Notional amount of derivative | € |  |  |  |  | € 10 |
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 | $ 0.0 | $ (0.1) | $ 0.1 | $ (0.7) |  |
2022 Term Loan |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 5.44%
2022 Term Loan | Interest Rate Swap |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  | $ 50.0

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