RETIREMENT PLANS - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Retirement Benefits [Abstract]
Net periodic benefit costs		$ 1.0	$ 0.5	$ 1.9	$ 1.0
Service cost component		0.9	$ 0.7	1.9	$ 1.3
Estimated fair value of plan assets		31.9		31.9		$ 30.8
Defer payment and taxation, base salary, percentage (up to)	75.00%
Defer payment and taxation, bonus and other eligible cash compensation, percentage (up to)	100.00%
Deferred compensation plan, fair value of assets		$ 1.5		$ 1.5