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FAIR VALUE MEASUREMENT - Fair Value Hierarchy of Financial Instruments Held (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
U.S. Treasury securities | $ 176.6 | $ 70.0
Deferred compensation plan assets | 31.0 | 40.3
Note receivable - building sale | 6.4 | 6.2
Total assets | 214.0 | 116.5
Liabilities: |  |
Deferred compensation plan liabilities | 31.0 | 40.3
Debt | 1,345.1 | 1,317.0
Total liabilities | 1,376.1 | 1,357.3
Level 1 |  |
Assets: |  |
U.S. Treasury securities | 176.6 | 70.0
Deferred compensation plan assets | 31.0 | 40.3
Note receivable - building sale | 0.0 | 0.0
Total assets | 207.6 | 110.3
Liabilities: |  |
Deferred compensation plan liabilities | 31.0 | 40.3
Debt | 0.0 | 0.0
Total liabilities | 31.0 | 40.3
Level 2 |  |
Assets: |  |
U.S. Treasury securities | 0.0 | 0.0
Deferred compensation plan assets | 0.0 | 0.0
Note receivable - building sale | 0.0 | 0.0
Total assets | 0.0 | 0.0
Liabilities: |  |
Deferred compensation plan liabilities | 0.0 | 0.0
Debt | 1,345.1 | 1,317.0
Total liabilities | 1,345.1 | 1,317.0
Level 3 |  |
Assets: |  |
U.S. Treasury securities | 0.0 | 0.0
Deferred compensation plan assets | 0.0 | 0.0
Note receivable - building sale | 6.4 | 6.2
Total assets | 6.4 | 6.2
Liabilities: |  |
Deferred compensation plan liabilities | 0.0 | 0.0
Debt | 0.0 | 0.0
Total liabilities | $ 0.0 | $ 0.0

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