RETIREMENT PLANS - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Retirement Benefits [Abstract]
Net periodic benefit costs		$ 1.0	$ 1.0	$ 3.0	$ 2.1
Service cost component		1.0	$ 0.7	2.9	$ 2.0
Estimated fair value of plan assets		33.2		33.2		$ 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		$ 1.7		$ 1.7