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v3.23.1

Derivatives and Fair Value Measurements - Narrative (Details) t in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 USD ($) t $ / $ | Mar. 31, 2022 USD ($) | Mar. 31, 2023 AUD ($) $ / $ | Dec. 31, 2022 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |
Unobservable Measurement Input, Uncertainty, Description | 10 |  |  |
Asset impairment | $ 2.0 | $ 0.0 |  |
Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative assets (liabilities), at fair value | 0.0 | 0.0 |  |
Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Variation margin posted (received) | (48.8) |  |  | $ (209.7)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 99.2 | (286.9) |  |
Foreign currency option contracts |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional amount | $ 350.0 |  | $ 632,000,000 |
Derivative, Floor Price |  |  | 0.63 |
Derivative, Cap Price |  |  | 0.73 |
Foreign currency option contracts | Minimum |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, exchange rate cap (in dollars per share) | $ / $ | 0.70 |  | 0.70 |
Foreign currency option contracts | Maximum |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, exchange rate cap (in dollars per share) | $ / $ | 0.75 |  | 0.75 |
Foreign currency option contracts | Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | $ (2.2) | 3.3 |  |
Financial trading contracts |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative notional amount (in tonnes) | t | 0.3 |  |  |
Financial trading contracts | Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | $ (17.3) | 10.8 |  |
Diesel Fuel Hedge Contracts |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional amount |  |  | $ 0 |
Coal Contract and Physical commodity purchase / sale contracts | Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 118.7 | (301.0) |  |
Gain (Loss) on Derivative Instruments | Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax |  | (237.0) |  |
Forward Contracts | Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 0.0 | 64.0 |  |
Derivative contracts related to forecasted sales | Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 118.7 | $ (301.0) |  |
Variation Margin Cash | Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Variation margin posted (received) | 48.8 |  |  | 198.0
Total Margin Posted |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset | 59.8 |  |  | 255.5
Initial Margin Posted |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset | $ 11.0 |  |  | $ 57.5

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- Definition The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. + References No definition available. + Details
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