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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2020
Fair Value Disclosures [Abstract] |
Financial assets and liabilities at fair value on a recurring basis |
Recurring Fair Value Measurements |  | As of June 30, 2020 |  |  |  |  |  |
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
ASSETS: |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 162.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 162.2 |
Trust assets (1) |  | 0.8 |  |  | — |  |  | — |  |  | 0.8 |
Derivative instruments |  | — |  |  | 28.5 |  |  | 6.1 |  |  | 34.6 |
TOTAL |  | $ | 163.0 |  |  | $ | 28.5 |  |  | $ | 6.1 |  |  | $ | 197.6 |
LIABILITIES: |  |  |  |  |  |  |  |
Contingent obligation – net |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Derivative instruments |  | — |  |  | 14.2 |  |  | 1.5 |  |  | 15.7 |
TOTAL |  | $ | — |  |  | $ | 14.2 |  |  | $ | 1.5 |  |  | $ | 15.7 |
(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. (2) Surety bonds were invested in U.S. treasury bills and represent collateral against our workers' compensation insurance policy.
Recurring Fair Value Measurements |  | As of December 31, 2019 |  |  |  |  |  |
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
ASSETS: |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 23.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 23.3 |
Trust assets (1) |  | 0.2 |  |  | — |  |  | — |  |  | 0.2 |
Surety bonds (2) |  | 1.8 |  |  | — |  |  | — |  |  | 1.8 |
Derivative instruments |  | — |  |  | 9.1 |  |  | 10.6 |  |  | 19.7 |
TOTAL |  | $ | 25.3 |  |  | $ | 9.1 |  |  | $ | 10.6 |  |  | $ | 45.0 |
LIABILITIES: |  |  |  |  |  |  |  |
Contingent obligation – net |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Derivative instruments |  | — |  |  | 1.3 |  |  | 2.9 |  |  | 4.2 |
TOTAL |  | $ | — |  |  | $ | 1.3 |  |  | $ | 2.9 |  |  | $ | 4.2 |
(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. (2) Surety bonds were invested in U.S. treasury bills and represent collateral against our workers' compensation insurance policy.
Schedule of valuation methodology for assets and liabilities at fair value | We use the following valuation techniques and inputs for fair value measurements categorized within Level 2 of the fair value hierarchy:
Level 2 Fair Value Measurements: |  |  |  |  |  |
Asset / Liability |  | Level |  | Valuation Techniques |  | Inputs
LME forward financial sales contracts |  | 2 |  | Discounted cash flows |  | Quoted LME forward market
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
Nord Pool power price swaps |  | 2 |  | Discounted cash flows |  | Quoted Nord Pool forward market
NYMEX Henry Hub natural gas price swaps |  | 2 |  | Discounted cash flows |  | Quoted Henry Hub forward market
MISO Indiana Hub power price swaps |  | 2 |  | Discounted cash flows |  | Quoted Indy Hub forward market
FX swaps |  | 2 |  | Discounted cash flows |  | Euro/USD forward exchange rate
When valuing Level 3 assets and liabilities, we use certain significant unobservable inputs. Management incorporates various inputs and assumptions including forward commodity prices, commodity price volatility, and macroeconomic conditions, including interest rates and discount rates. Our estimates of significant unobservable inputs are ultimately based on our estimates of risks that market participants would consider when valuing our assets and liabilities. The following table presents the inputs for fair value measurements categorized within Level 3 of the fair value hierarchy, along with information regarding significant unobservable inputs used to value Level 3 assets and liabilities:
Level 3 Fair Value Measurements: |  |  |  |  |  |  |  |  |  |
Asset / Liability |  | Fair Value at June 30, 2020 |  | Valuation Technique |  | Observable Inputs |  | Significant Unobservable Input |  | Value/Range of Unobservable Input
LME forward financial sales contracts |  | $ | 6.1 |  |  | Discounted cash flows |  | Quoted LME forward market prices |  | Discount rate (1) |  | 10.00%
Contingent obligation |  | $ | — |  |  | Discounted cash flows |  | Quoted LME forward market prices |  | Management's estimates of the LME forward market price beyond the quoted periods (2) |  | $1,594/T-$2,179/T
Hawesville L4 power price swaps |  | $ | (1.5) |  |  | Discounted cash flows |  | Quoted Indy Hub forward market prices |  | Estimates of locational margin prices during contract term in megawatt hours (MWh) (3) |  | $0.52/MWh
(1) Represents risk adjusted discount rate. (2) Represents the range of estimated forward LME prices of primary aluminum through the term of the agreement in December 2028. (3) Represents historical average of locational margin prices in the past three years.
Schedule of fair value reconciliation of Level 3 assets and liabilities measured at fair value | The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis.
|  | Level 3 Assets |  | Level 3 Liabilities
For the three months ended June 30, 2020 |  | LME forward financial sales contracts |  | Hawesville L4 power price swaps
Balance as of April 1, 2020 |  | $ | 7.8 |  |  | $ | (3.2) |
Total realized/unrealized gains (losses) |  |  |  |
Included in net income (loss) (1) |  | (1.7) |  |  | 0.0 |
Purchases, sales, settlements |  |  |  |
Purchases |  | — |  |  | — |
Sales |  | — |  |  | — |
Settlements |  | — |  |  | 1.7 |
Transfers into Level 3 |  | — |  |  | — |
Transfers out of Level 3 |  | — |  |  | — |
Balance as of June 30, 2020 |  | $ | 6.1 |  |  | $ | (1.5) |
Change in unrealized gains (losses) (1) |  | $ | (1.7) |  |  | $ | 1.7 |
(1) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."
For the three months ended June 30, 2019 |  | Level 3 Assets |  |  | Level 3 Liabilities |  |  |
|  | Nord Pool power price swaps | U.S. LME forward financial sales contracts |  | Hawesville L4 Power Price Swaps | Iceland LME forward financial sales contracts | MWP forward financial sales contracts | FX Swaps
Balance as of April 1, 2019 |  | $ | 3.7 |  | $ | (1.8) |  |  | $ | — |  | $ | (0.3) |  | $ | (0.9) |  | $ | (0.6) |
Total realized/unrealized gains (losses) |  |  |  |  |  |  |  |
Included in Net Income (2) |  | — |  | 8.7 |  |  | — |  | — |  | — |  | — |
Purchases, sales, settlements |  |  |  |  |  |  |  |
Purchases |  | — |  | — |  |  | — |  | — |  | — |  | — |
Sales |  | — |  | — |  |  | — |  | — |  | — |  | — |
Settlements |  | — |  | — |  |  | — |  | — |  | — |  | — |
Transfers into Level 3 (1) |  | — |  | — |  |  | (2.7) |  | — |  | — |  | — |
Transfers out of Level 3 |  | (3.7) |  | — |  |  | — |  | 0.3 |  | 0.9 |  | 0.6 |
Balance as of June 30, 2019 |  | $ | — |  | $ | 6.9 |  |  | $ | (2.7) |  | $ | — |  | $ | — |  | $ | — |
Change in unrealized gains (losses) (2) |  | $ | — |  | $ | 8.7 |  |  | $ | (2.7) |  | $ | — |  | $ | — |  | $ | — |
(1) Transfer into Level 3 resulting from derivative contracts entered into during the second quarter of 2019. (2) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."
|  | Level 3 Assets |  | Level 3 Liabilities
For the six months ended June 30, 2020 |  | LME forward financial sales contracts |  | Hawesville L4 power price swaps
Balance as of January 1, 2020 |  | $ | 10.6 |  |  | $ | (2.9) |
Total realized/unrealized gains (losses) |  |  |  |
Included in net income (loss) (2) |  | 5.0 |  |  | (1.4) |
Purchases, sales, settlements |  |  |  |
Purchases |  | — |  |  | — |
Sales |  | — |  |  | — |
Settlements |  | — |  |  | 2.8 |
Transfers into Level 3 |  | — |  |  | — |
Transfers out of Level 3 (1) |  | (9.5) |  |  | — |
Balance as of June 30, 2020 |  | $ | 6.1 |  |  | $ | (1.5) |
Change in unrealized gains (losses) (2) |  | $ | 5.0 |  |  | $ | 1.4 |
(1) Transfer out of Level 3 due to period of time remaining in derivative contract. (2) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."
For the six months ended June 30, 2019 |  | Level 3 Assets |  |  | Level 3 Liabilities |  |
|  | Nord Pool power price swaps | US LME forward financial sales contracts |  | Hawesville L4 Power Price Swaps | Iceland LME forward financial sales contracts | FX Swaps
Balance as of January 1, 2019 |  | $ | 4.7 |  | $ | 0.3 |  |  | $ | — |  | $ | (0.2) |  | $ | (0.3) |
Total realized/unrealized gains (losses) |  |  |  |  |  |  |
Included in Net Income (2) |  | (1.0) |  | 6.8 |  |  | — |  | (0.1) |  | (0.3) |
Purchases, sales, settlements |  |  |  |  |  |  |
Purchases |  | — |  | — |  |  | — |  | — |  | — |
Sales |  | — |  | — |  |  | — |  | — |  | — |
Settlements |  | — |  | — |  |  | — |  | — |  | — |
Transfers into Level 3 (1) |  | — |  | (0.2) |  |  | (2.7) |  | — |  | — |
Transfers out of Level 3 |  | (3.7) |  | — |  |  | — |  | 0.3 |  | 0.6 |
Balance as of June 30, 2019 |  | $ | — |  | $ | 6.9 |  |  | $ | (2.7) |  | $ | — |  | $ | — |
Change in unrealized gains (losses) (2) |  | $ | (1.0) |  | $ | 6.6 |  |  | $ | (2.7) |  | $ | (0.1) |  | $ | (0.3) |
(1) Transfer into Level 3 resulting from derivative contracts entered into during the first six months of 2019. (2) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts".

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- Definition Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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