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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Assets and Liabilities Recorded at Fair Value | Assets and liabilities recorded at fair value in the accompanying unaudited condensed consolidated balance sheets as of September 30, 2025 and December 31, 2024 were as follows:
| Fair Value Based on Significant Other Observable Inputs (Level 2)
| September 30, 2025 |  | December 31, 2024
| (In millions)
Assets: |  |  |
Cash surrender value of life insurance policies (1) | $ | 51.4 |  |  | $ | 47.3 |
Interest rate caps designated as hedges (2) | 0.1 |  |  | — |
Total assets | $ | 51.5 |  |  | $ | 47.3 |
(1)Included in other assets in the accompanying unaudited condensed consolidated balance sheets. (2)As of September 30, 2025, approximately $0.1 million was included in other assets in the accompanying unaudited condensed consolidated balance sheet.
Fair Value and Carrying Value of Significant Fixed Rate Long-Term Debt | As of September 30, 2025 and December 31, 2024, the fair value and the carrying value of Sonic’s significant fixed rate long-term debt were as follows:
| September 30, 2025 |  | December 31, 2024
| Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value
| (In millions)
4.875% Notes (1) | $ | 477.5 |  |  | $ | 500.0 |  |  | $ | 447.5 |  |  | $ | 500.0 |
4.625% Notes (1) | $ | 628.1 |  |  | $ | 650.0 |  |  | $ | 594.8 |  |  | $ | 650.0 |
Mortgage Notes (2) | $ | 40.1 |  |  | $ | 41.2 |  |  | $ | 93.4 |  |  | $ | 96.1 |
(1)As determined by market quotations from similar securities as of September 30, 2025 and December 31, 2024, respectively (Level 2). (2)As determined by the DCF method (Level 2).

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + 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/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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