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PENSION AND POST-RETIREMENT BENEFITS - Fair Value of Pension Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 463.0 $ 462.4  
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 463.0 462.4 $ 432.4
UNITED STATES | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 377.6 380.6  
International Plans | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 85.4 $ 81.8