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Commitment, Contingencies And Guarantees (Tables) | 12 Months Ended
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Dec. 31, 2023
Long-term Purchase Commitment [Line Items] |
Unrecorded Unconditional Purchase Obligations Disclosure | The following is a schedule of unconditional purchase obligations required under the power purchase, transmission services and natural gas transportation and storage agreements (in millions):
| PPAs (a) |  | Transmission Services Agreements |  | Natural gas supply, transportation and storage agreements |
Future commitments for the year ending December 31, |  |  |  |  |  |
2024 | $ | 2.7 |  | $ | 12.2 |  | $ | 163.0 |
2025 |  | — |  |  | — |  |  | 135.0 |
2026 |  | — |  |  | — |  |  | 110.8 |
2027 |  | — |  |  | — |  |  | 79.5 |
2028 |  | — |  |  | — |  |  | 58.0 |
Thereafter |  | — |  |  | — |  |  | 95.2 |
Total future commitments | $ | 2.7 |  | $ | 12.2 |  | $ | 641.5 |
____________________ (a) This schedule does not reflect renewable energy PPA future obligations since these agreements vary based on weather conditions.
Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity | As of December 31, 2023, scheduled maturities of operating lease payments to be received in future years were as follows (in millions):
| Operating Leases |
2024 | $ | 2.2 |
2025 |  | 2.2 |
2026 |  | 2.0 |
2027 |  | 1.9 |
2028 |  | 1.9 |
Thereafter |  | 48.3 |
Total lease receivables | $ | 58.5 |
Schedule of Guarantor Obligations | We had the following guarantees in place as of (in millions):
| Maximum Exposure at |
Nature of Guarantee | December 31, 2023 |
Indemnification for reclamation/surety bonds | $ | 100.9 |
Guarantees supporting business transactions |  | 462.9 |
Total guarantees | $ | 563.8 |

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- Definition Tabular disclosure of maturity of undiscounted cash flows to be received by lessor on annual basis for operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479773/842-30-50-12 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of each guarantee obligation, or each group of similar guarantee obligations, including (a) the nature of the guarantee, including its term, how it arose, and the events or circumstances that would require the guarantor to perform under the guarantee; (b) the maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee; (c) the current carrying amount of the liability, if any, for the guarantor's obligations under the guarantee; and (d) the nature of any recourse provisions under the guarantee, and any assets held either as collateral or by third parties, and any relevant related party disclosure. Excludes disclosures about product warranties. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 + Details
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- Definition Tabular disclosure of unconditional purchase obligation not recognized as liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 440 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482648/440-10-50-4 + Details
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