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FAIR VALUE MEASUREMENT - Fair Value Hierarchy of Financial Instruments Held (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Assets:    
U.S. Treasury securities $ 78.0 $ 70.0
Deferred compensation plan assets 27.9 40.3
Note receivable - building sale 6.3 6.2
Total assets 112.2 116.5
Liabilities:    
Deferred compensation plan liabilities 27.9 40.3
Debt 1,335.4 1,317.0
Total liabilities 1,363.3 1,357.3
Level 1    
Assets:    
U.S. Treasury securities 78.0 70.0
Deferred compensation plan assets 27.9 40.3
Note receivable - building sale 0.0 0.0
Total assets 105.9 110.3
Liabilities:    
Deferred compensation plan liabilities 27.9 40.3
Debt 0.0 0.0
Total liabilities 27.9 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 1,335.4 1,317.0
Total liabilities 1,335.4 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 6.3 6.2
Total assets 6.3 6.2
Liabilities:    
Deferred compensation plan liabilities 0.0 0.0
Debt 0.0 0.0
Total liabilities $ 0.0 $ 0.0