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DEFINED BENEFIT PLANS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Retirement Benefits [Abstract]          
Net periodic benefit costs $ 1.0 $ 0.5 $ 2.1 $ 1.7  
Service cost component 0.7 $ 0.7 2.0 $ 1.4  
Estimated fair value of plan assets $ 28.6   $ 28.6   $ 31.1