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FAIR VALUE MEASUREMENT -Fair Value Hierarchy for Assets and Liabilities on a Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
Note receivable - building sale |  | $ 6.2
Total assets | $ 1,578.3 | 116.5
US And UK Treasury securities |  |
Assets: |  |
Cash and cash equivalents | 1,294.1 |
Money market funds |  |
Assets: |  |
Cash and cash equivalents | 248.1 |
US Treasury Securities |  |
Assets: |  |
Investments | 0.3 | 70.0
Mutual funds |  |
Assets: |  |
Investments | 28.5 | 23.8
Money market funds |  |
Assets: |  |
Investments | 7.3 | 16.5
Level 1 |  |
Assets: |  |
Note receivable - building sale |  | 0.0
Total assets | 1,578.3 | 110.3
Level 1 | US And UK Treasury securities |  |
Assets: |  |
Cash and cash equivalents | 1,294.1 |
Level 1 | Money market funds |  |
Assets: |  |
Cash and cash equivalents | 248.1 |
Level 1 | US Treasury Securities |  |
Assets: |  |
Investments | 0.3 | 70.0
Level 1 | Mutual funds |  |
Assets: |  |
Investments | 28.5 | 23.8
Level 1 | Money market funds |  |
Assets: |  |
Investments | 7.3 | 16.5
Level 2 |  |
Assets: |  |
Note receivable - building sale |  | 0.0
Total assets | 0.0 | 0.0
Level 2 | US And UK Treasury securities |  |
Assets: |  |
Cash and cash equivalents | 0.0 |
Level 2 | Money market funds |  |
Assets: |  |
Cash and cash equivalents | 0.0 |
Level 2 | US Treasury Securities |  |
Assets: |  |
Investments | 0.0 | 0.0
Level 2 | Mutual funds |  |
Assets: |  |
Investments | 0.0 | 0.0
Level 2 | Money market funds |  |
Assets: |  |
Investments | 0.0 | 0.0
Level 3 |  |
Assets: |  |
Note receivable - building sale |  | 6.2
Total assets | 0.0 | 6.2
Level 3 | US And UK Treasury securities |  |
Assets: |  |
Cash and cash equivalents | 0.0 |
Level 3 | Money market funds |  |
Assets: |  |
Cash and cash equivalents | 0.0 |
Level 3 | US Treasury Securities |  |
Assets: |  |
Investments | 0.0 | 0.0
Level 3 | Mutual funds |  |
Assets: |  |
Investments | 0.0 | 0.0
Level 3 | Money market funds |  |
Assets: |  |
Investments | $ 0.0 | $ 0.0

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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 3: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: 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 5: 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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