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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, 2019
Dec. 31, 2018
Change in fair value of plan assets:    
Beginning of year $ 60.4 $ 71.2
Actual return on plan assets:    
Currency exchange rate impact 1.1 (0.4)
End of year 63.2 60.4
Level 3    
Change in fair value of plan assets:    
Beginning of year 1.0  
Actual return on plan assets:    
End of year 0.9 1.0
Level 3 | Insurance Contracts    
Change in fair value of plan assets:    
Beginning of year 1.0 2.7
Actual return on plan assets:    
Relating to assets still held at year end   (1.6)
Purchases, sales and settlements (0.1)  
Currency exchange rate impact   (0.1)
End of year $ 0.9 $ 1.0