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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Financial assets and liabilities at fair value on a recurring basis |
Recurring Fair Value Measurements |  | As of March 31, 2019
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
ASSETS: |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 14.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 14.3 |
Trust assets (1) |  | 0.1 |  |  | — |  |  | — |  |  | 0.1 |
Surety bonds |  | 2.1 |  |  | — |  |  | — |  |  | 2.1 |
Derivative instruments |  | — |  |  | 5.2 |  |  | 3.7 |  |  | 8.9 |
TOTAL |  | $ | 16.5 |  |  | $ | 5.2 |  |  | $ | 3.7 |  |  | $ | 25.4 |
LIABILITIES: |  |  |  |  |  |  |  |
Contingent obligation – net |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Derivative instruments |  | — |  |  | 5.2 |  |  | 3.6 |  |  | 8.8 |
TOTAL |  | $ | — |  |  | $ | 5.2 |  |  | $ | 3.6 |  |  | $ | 8.8 |
Recurring Fair Value Measurements |  | As of December 31, 2018
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
ASSETS: |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 7.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 7.5 |
Trust assets (1) |  | 0.1 |  |  | — |  |  | — |  |  | 0.1 |
Surety bonds |  | 2.1 |  |  | — |  |  | — |  |  | 2.1 |
Derivative instruments |  | — |  |  | 3.2 |  |  | 5.0 |  |  | 8.2 |
TOTAL |  | $ | 9.7 |  |  | $ | 3.2 |  |  | $ | 5.0 |  |  | $ | 17.9 |
LIABILITIES: |  |  |  |  |  |  |  |
Contingent obligation – net |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Derivative instruments |  | — |  |  | 2.0 |  |  | 0.5 |  |  | 2.5 |
TOTAL |  | $ | — |  |  | $ | 2.0 |  |  | $ | 0.5 |  |  | $ | 2.5 |
(1) Trust assets are currently invested in money market funds. These trust assets are held to fund the non-qualified supplemental executive pension benefit obligations for certain of our officers.
Schedule of valuation methodology for assets and liabilities at fair value | The following section describes the valuation techniques and inputs used for fair value measurements categorized within Level 2 or Level 3 of the fair value hierarchy:
Level 2 and Level 3 Fair Value Measurements:
Asset / Liability |  | Level |  | Valuation Techniques |  | Inputs
LME forward financial sales contracts |  | 3 |  | Discounted cash flows |  | Quoted LME forward market, discount rate
MWP forward financial sales contracts |  | 2 |  | Discounted cash flows |  | Quoted MWP forward market
Fixed for floating swaps |  | 2 |  | Discounted cash flows |  | Quoted LME forward market, quoted MWP forward market
Power price swaps |  | 3 |  | Discounted cash flows |  | Quoted Nordpool forward market, discount rate
FX swaps |  | 3 |  | Discounted cash flows |  | Euro/USD forward exchange rate, discount rate
Contingent obligation |  | 3 |  | Discounted cash flows |  | Quoted LME forward market, management’s estimates of the LME forward market prices for periods beyond the quoted periods, management’s estimates of future level of operations

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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