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FAIR VALUE MEASUREMENT - Schedule of fair value hierarchy of financial instruments held (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Assets:    
Financial investments $ 71.5 $ 67.9
Deferred compensation plan assets 24.0 24.5
Total assets 95.5 92.4
Liabilities:    
Contingent consideration liabilities 32.1 32.7
Deferred compensation plan liabilities 24.0 24.5
Debt 1,187.8 1,319.1
Total liabilities 1,243.9 1,376.3
Level 1    
Assets:    
Financial investments 71.5 67.9
Deferred compensation plan assets 24.0 24.5
Total assets 95.5 92.4
Liabilities:    
Deferred compensation plan liabilities 24.0 24.5
Total liabilities 24.0 24.5
Level 2    
Liabilities:    
Debt 1,187.8 1,319.1
Total liabilities 1,187.8 1,319.1
Level 3    
Liabilities:    
Contingent consideration liabilities 32.1 32.7
Total liabilities $ 32.1 $ 32.7