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Investments (Tables) | 9 Months Ended
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Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Marketable Securities | The following table presents the remaining maturities and values of our marketable securities as of the dates shown.
|  | September 30, 2024 |  | December 31, 2023
(in millions, except maturities in months) |  | Remaining Maturities |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
U.S. treasury and government agencies |  | 3 to 77 months |  | $ | 23.0 |  |  | $ | 21.5 |  |  | $ | 24.9 |  |  | $ | 22.9 |
Corporate debt securities |  | 8 to 103 months |  | 17.3 |  |  | 17.0 |  |  | 20.0 |  |  | 19.2 |
State and municipal bonds |  | 6 to 169 months |  | 14.2 |  |  | 14.1 |  |  | 15.5 |  |  | 15.1 |
Total marketable securities |  |  |  | $ | 54.5 |  |  | $ | 52.6 |  |  | $ | 60.4 |  |  | $ | 57.2 |
Equity Investments without Readily Determinable Fair Values | The following table summarizes the activity related to these equity investments during the periods presented.
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Investment in equity securities |  | $ | 0.2 |  |  | $ | 10.3 |  |  | $ | 0.2 |  |  | $ | 15.3 |
Upward adjustments (1) |  | — |  |  | 2.3 |  |  | — |  |  | 20.0 |
(1) Our updated investment value in 2023 was determined using a hybrid backsolve method, a valuation approach incorporating both IPO and M&A scenarios to estimate the value based on recently issued shares.

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- Definition Tabular disclosure of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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