LONG-TERM DEBT - Schedule Of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term Debt, Total	$ 192.2	$ 188.2
Term Loan A
Debt Instrument [Line Items]
Long-term Debt, Gross	199.3	199.5
Accrued interest payable	12.7	10.2
Unamortized discount and debt issuance costs	(19.8)	(21.5)
Long-term Debt, Total	192.2	188.2
Term Loan A | Term Loan A
Debt Instrument [Line Items]
Long-term Debt, Gross	99.3	99.5
Term Loan A | Term Loan B
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 100.0	$ 100.0