EMPLOYER SPONSORED BENEFIT PLANS - Narrative (Details) - United States - Pension plan - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
ISS Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Pre-tax settlement loss				$ 0.4
IPM Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected employer contributions during remainder of fiscal year	$ 0.7		$ 0.7
Contributions made by company to domestic pension plan	$ 0.2	$ 0.0	$ 0.4	$ 0.4