EMPLOYER SPONSORED BENEFIT PLANS - Narrative (Details) - United States - Pension plan - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
IPM Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected employer contributions during remainder of fiscal year	$ 0.7
Contributions made by company to domestic pension plan	$ 0.2	$ 0.4
ISS Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Pre-tax settlement loss		$ 0.4