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Fair Value Measurements - Schedule of Debt and Equity Securities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Fair Value Disclosures [Abstract] |  |
Available-for-sale debt securities, cost | $ 12.1 | $ 12.1
Equity securities, cost | 20.0 | 20.0
Total debt and equity securities, cost | 32.1 | 32.1
Available-for-sale debt securities, fair value | 12.3 | 12.3
Equity securities, fair value | 20.0 | 20.0
Total debt and equity securities, fair value | 32.3 | 32.3
Available-for-sale debt securities, gross unrealized gains | 0.2 | 0.2
Available-for-sale debt securities, gross unrealized losses | $ 0.0 | $ 0.0

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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/2003/role/disclosureRef -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 + Details
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