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FAIR VALUE MEASUREMENT - Fair Value Hierarchy for Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
Note receivable - building sale | $ 6.4 | $ 6.2
Total assets | 214.0 | 116.5
Level 1 |  |
Assets: |  |
Note receivable - building sale | 0.0 | 0.0
Total assets | 207.6 | 110.3
Level 2 |  |
Assets: |  |
Note receivable - building sale | 0.0 | 0.0
Total assets | 0.0 | 0.0
Level 3 |  |
Assets: |  |
Note receivable - building sale | 6.4 | 6.2
Total assets | 6.4 | 6.2
Fair Value, Recurring |  |
Assets: |  |
Note receivable - building sale | 6.4 | 6.2
Total assets | 214.0 | 116.5
Fair Value, Recurring | US Treasury Securities |  |
Assets: |  |
Debt securities | 176.6 | 70.0
Fair Value, Recurring | Mutual funds |  |
Assets: |  |
Marketable securities | 24.2 | 23.8
Fair Value, Recurring | Money market funds |  |
Assets: |  |
Marketable securities | 6.8 | 16.5
Fair Value, Recurring | Level 1 |  |
Assets: |  |
Note receivable - building sale | 0.0 | 0.0
Total assets | 207.6 | 110.3
Fair Value, Recurring | Level 1 | US Treasury Securities |  |
Assets: |  |
Debt securities | 176.6 | 70.0
Fair Value, Recurring | Level 1 | Mutual funds |  |
Assets: |  |
Marketable securities | 24.2 | 23.8
Fair Value, Recurring | Level 1 | Money market funds |  |
Assets: |  |
Marketable securities | 6.8 | 16.5
Fair Value, Recurring | Level 2 |  |
Assets: |  |
Note receivable - building sale | 0.0 | 0.0
Total assets | 0.0 | 0.0
Fair Value, Recurring | Level 2 | US Treasury Securities |  |
Assets: |  |
Debt securities | 0.0 | 0.0
Fair Value, Recurring | Level 2 | Mutual funds |  |
Assets: |  |
Marketable securities | 0.0 | 0.0
Fair Value, Recurring | Level 2 | Money market funds |  |
Assets: |  |
Marketable securities | 0.0 | 0.0
Fair Value, Recurring | Level 3 |  |
Assets: |  |
Note receivable - building sale | 6.4 | 6.2
Total assets | 6.4 | 6.2
Fair Value, Recurring | Level 3 | US Treasury Securities |  |
Assets: |  |
Debt securities | 0.0 | 0.0
Fair Value, Recurring | Level 3 | Mutual funds |  |
Assets: |  |
Marketable securities | 0.0 | 0.0
Fair Value, Recurring | Level 3 | Money market funds |  |
Assets: |  |
Marketable securities | $ 0.0 | $ 0.0

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-14 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-9 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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