INDEBTEDNESS - Outstanding (Details) - Senior Secured Credit Facility [Member] $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Debt Instrument, Term	5 years
Delayed Draw Term Loan [Member]
Long-term debt, gross	$ 113.6
Total debt issuance costs, net	0.3
Debt issuance costs, current	0.1
Debt issuance costs, noncurrent	0.2
Term Loan [Member]
Long-term debt, gross	65.9
Total debt issuance costs, net	0.9
Debt issuance costs, current	0.3
Debt issuance costs, noncurrent	0.6
Revolver [Member]
Long-term debt, gross	7.5
Total debt issuance costs, net	0.8
Debt issuance costs, current	0.3
Debt issuance costs, noncurrent	$ 0.5