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EMPLOYEE BENEFIT PLANS - Summary of Changes in Fair Value of Defined Benefit Plan Assets Classified as Level 3 (Details) - Defined benefit pension plans - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Beginning of year $ 63.2 $ 60.4
Currency exchange rate impact 6.0 1.1
End of year 73.3 63.2
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Beginning of year 0.9  
End of year 1.0 0.9
Level 3 | Insurance Contracts    
Defined Benefit Plan Disclosure [Line Items]    
Beginning of year 0.9 1.0
Purchases, sales and settlements   (0.1)
Currency exchange rate impact 0.1  
End of year $ 1.0 $ 0.9