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EMPLOYEE BENEFIT PLANS - Pension Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 340.7 $ 304.1  
United States | Defined Benefit Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 36.0 34.3 $ 31.9
United States | Defined Benefit Pension Plans | Equity security funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18.6 16.4  
United States | Defined Benefit Pension Plans | Debt security funds and other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15.8 16.3  
United States | Defined Benefit Pension Plans | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.6 1.6  
Foreign Plan | Defined Benefit Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 304.7 269.8 $ 239.4
Foreign Plan | Defined Benefit Pension Plans | Equity security funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 74.3 70.8  
Foreign Plan | Defined Benefit Pension Plans | Debt security funds and other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 213.8 191.3  
Foreign Plan | Defined Benefit Pension Plans | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 16.6 $ 7.7