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Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following tables present financial assets and liabilities measured and recorded at fair value on our Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy as of December 31, 2023 and December 31, 2022:
Recurring Fair Value Measurements December 31, 2023 (in millions) | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Balance as of December 31, 2023
Assets |  |  |  |  |  |  |
Risk management assets | $ | — |  |  | $ | 23.3 |  |  | $ | — |  |  | $ | 23.3 |
Available-for-sale debt securities | — |  |  | 159.1 |  |  | — |  |  | 159.1 |
Total | $ | — |  |  | $ | 182.4 |  |  | $ | — |  |  | $ | 182.4 |
Liabilities |  |  |  |  |  |  |
Risk management liabilities | $ | — |  |  | $ | 9.4 |  |  | $ | — |  |  | $ | 9.4 |
Total | $ | — |  |  | $ | 9.4 |  |  | $ | — |  |  | $ | 9.4 |
Recurring Fair Value Measurements December 31, 2022 (in millions) | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Balance as of December 31, 2022
Assets |  |  |  |  |  |  |
Risk management assets | $ | — |  |  | $ | 84.8 |  |  | $ | — |  |  | $ | 84.8 |
Available-for-sale debt securities | — |  |  | 151.6 |  |  | — |  |  | 151.6 |
Total | $ | — |  |  | $ | 236.4 |  |  | $ | — |  |  | $ | 236.4 |
Liabilities |  |  |  |  |  |  |
Risk management liabilities | $ | — |  |  | $ | 3.0 |  |  | $ | — |  |  | $ | 3.0 |
Total | $ | — |  |  | $ | 3.0 |  |  | $ | — |  |  | $ | 3.0 |
Debt Securities, Available-for-sale | The amortized cost, gross unrealized gains and losses, allowance for credit losses, and fair value of available-for-sale securities at December 31, 2023 and 2022 were:
December 31, 2023 (in millions) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses(1) |  | Allowance for Credit Losses |  | Fair Value
Available-for-sale debt securities |  |  |  |  |  |  |  |  |
U.S. Treasury debt securities | $ | 63.8 |  |  | $ | — |  |  | $ | (3.2) |  |  | $ | — |  |  | $ | 60.6 |
Corporate/Other debt securities | 105.2 |  |  | 0.8 |  |  | (6.9) |  |  | (0.6) |  |  | 98.5 |
Total | $ | 169.0 |  |  | $ | 0.8 |  |  | $ | (10.1) |  |  | $ | (0.6) |  |  | $ | 159.1 |
December 31, 2022 (in millions) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses(2) |  | Allowance for Credit Losses |  | Fair Value
Available-for-sale debt securities |  |  |  |  |  |  |  |  |
U.S. Treasury debt securities | $ | 67.7 |  |  | $ | — |  |  | $ | (4.5) |  |  | $ | — |  |  | $ | 63.2 |
Corporate/Other debt securities | 99.0 |  |  | — |  |  | (9.7) |  |  | (0.9) |  |  | 88.4 |
Total | $ | 166.7 |  |  | $ | — |  |  | $ | (14.2) |  |  | $ | (0.9) |  |  | $ | 151.6 |
(1) Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $58.7 and $74.8 million, respectively, at December 31, 2023. (2) Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $61.0 million and $85.5 million, respectively, at December 31, 2022.
Carrying Amount And Estimated Fair Values Of Financial Instruments | The carrying amount and estimated fair values of these financial instruments were as follows:
At December 31, (in millions) | Carrying Amount 2023 |  | Estimated Fair Value 2023 |  | Carrying Amount 2022 |  | Estimated Fair Value 2022
Long-term debt (including current portion) | $ | 11,079.3 |  |  | $ | 10,370.9 |  |  | $ | 9,553.6 |  |  | $ | 8,479.4 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + 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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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