INCOME TAXES - Narrative (Details) $ in Millions		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)
Income Tax Disclosure [Abstract]
Estimated increase in income taxes payable if all foreign earnings were repatriated	$ 2.0
Payroll tax deferral, CARES Act		$ 28.5
Payroll tax credit, CARES Act		0.7
Unrecognized tax benefits and related interest and penalties, all of which would affect our effective tax rate if recognized	40.0	40.0
Decrease in unrecognized tax benefits due to lapse of statute of limitations	$ 5.6	$ 5.6