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FAIR VALUE MEASUREMENT - Fair value hierarchy of financial instruments held (Details) - Fair Value, Nonrecurring - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
Deferred compensation plan assets | $ 35.8 | $ 40.3
Note receivable - building sale |  | 6.2
Total assets | 1,578.3 | 116.5
Liabilities: |  |
Deferred compensation plan liabilities | 35.8 | 40.3
Debt | 1,371.8 | 1,317.0
Total liabilities | 1,407.6 | 1,357.3
US And UK Treasury securities |  |
Assets: |  |
Cash and cash equivalents | 1,294.1 |
Money market funds |  |
Assets: |  |
Cash and cash equivalents | 248.1 |
Level 1 |  |
Assets: |  |
Deferred compensation plan assets | 35.8 | 40.3
Note receivable - building sale |  | 0.0
Total assets | 1,578.3 | 110.3
Liabilities: |  |
Deferred compensation plan liabilities | 35.8 | 40.3
Debt | 0.0 | 0.0
Total liabilities | 35.8 | 40.3
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 2 |  |
Assets: |  |
Deferred compensation plan assets | 0.0 | 0.0
Note receivable - building sale |  | 0.0
Total assets | 0.0 | 0.0
Liabilities: |  |
Deferred compensation plan liabilities | 0.0 | 0.0
Debt | 1,371.8 | 1,317.0
Total liabilities | 1,371.8 | 1,317.0
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 3 |  |
Assets: |  |
Deferred compensation plan assets | 0.0 | 0.0
Note receivable - building sale |  | 6.2
Total assets | 0.0 | 6.2
Liabilities: |  |
Deferred compensation plan liabilities | 0.0 | 0.0
Debt | 0.0 | 0.0
Total liabilities | 0.0 | 0.0
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 |
US Treasury Securities |  |
Assets: |  |
U.S. Treasury securities | 0.3 | 70.0
US Treasury Securities | Level 1 |  |
Assets: |  |
U.S. Treasury securities | 0.3 | 70.0
US Treasury Securities | Level 2 |  |
Assets: |  |
U.S. Treasury securities | 0.0 | 0.0
US Treasury Securities | Level 3 |  |
Assets: |  |
U.S. Treasury securities | $ 0.0 | $ 0.0

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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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