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Financial Instruments and Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Gains (losses) recognized related to equity investments |
| Nine Months Ended
| September 30,
| 2025 |  | 2024
Net losses recognized during the period on equity securities | $ | (10.1) |  |  | $ | (8.5) |
Less: Net gains (losses) recognized during the period on equity securities sold during the period | — |  |  | — |
Unrealized losses recognized during the reporting period on equity securities still held at the reporting date | $ | (10.1) |  |  | $ | (8.5) |
Summary Of Carrying Values And Fair Values Of Fixed Rate Debt | A summary of the aggregate carrying values and fair values of our senior unsecured notes is as follows:
| September 30, 2025 |  | December 31, 2024
Carrying value | $ | 3,280.0 |  |  | $ | 2,782.1 |
Fair value | $ | 3,192.9 |  |  | $ | 2,578.6 |
Assets Measured and Recorded At Fair Value On A Nonrecurring Basis | The following table presents assets measured and recorded at fair value on a nonrecurring basis during the nine months ended September 30, 2025 and 2024:
|  | 2025 |  | 2024
Description |  | Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  | Gain/(Loss) |  | Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  | Gain/(Loss)
Equity investment |  | $ | — |  |  | $ | — |  |  | $ | 48.3 |  |  | $ | (8.4) |
Goodwill |  | $ | 75.2 |  |  | $ | (65.3) |  |  | $ | — |  |  | $ | — |
Franchise rights |  | $ | 42.7 |  |  | $ | (71.7) |  |  | $ | — |  |  | $ | — |
Long-lived assets held and used |  | $ | 13.5 |  |  | $ | (4.3) |  |  | $ | — |  |  | $ | (8.9) |
Long-lived assets held for sale |  | $ | 22.7 |  |  | $ | (2.4) |  |  | $ | 12.1 |  |  | $ | (1.3) |
Fair Value Measurement Inputs and Valuation Techniques | Quantitative Information about Level 3 Fair Value Measurements
Description |  | Fair Value at April 30, 2025 |  | Valuation Technique |  | Unobservable Input |  | Range (Average)
Franchise rights |  | $ | 42.7 |  |  | Discounted cash flow |  | Weighted average cost of capital |  | 8.9% - 9.1% (9.0%)
|  |  |  |  |  | Discount rate |  | 9.6% - 11.3% (10.4%)
|  |  |  |  |  | Long-term revenue growth rate |  | 2.0 | %
|  |  |  |  |  | Long-term pretax margin |  | 0.0% - 5.9% (2.4%)
|  |  |  |  |  | Contributory asset charges |  | 5.1% - 8.4% (6.2%)

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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://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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