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FAIR VALUE MEASUREMENT - Schedule of fair value hierarchy of financial instruments held (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Assets:    
Financial investments $ 0.5 $ 67.9
Deferred compensation plan assets 26.2 24.5
Total assets 26.7 92.4
Liabilities:    
Contingent consideration liabilities 75.2 32.7
Deferred compensation plan liabilities 26.2 24.5
Debt 1,298.9 1,319.1
Total liabilities 1,400.3 1,376.3
Level 1    
Assets:    
Financial investments 0.5 67.9
Deferred compensation plan assets 26.2 24.5
Total assets 26.7 92.4
Liabilities:    
Deferred compensation plan liabilities 26.2 24.5
Total liabilities 26.2 24.5
Level 2    
Liabilities:    
Debt 1,298.9 1,319.1
Total liabilities 1,298.9 1,319.1
Level 3    
Liabilities:    
Contingent consideration liabilities 75.2 32.7
Total liabilities $ 75.2 $ 32.7