RELATED PARTY TRANSACTIONS - Narrative (Details) - IAC $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)
Leasing Arrangements
Related Party Transaction
Received from affiliate	$ 0.1	$ 0.1
Paid to affiliate		0.3
Due from affiliates	0.2	0.2
Tax Sharing Agreement
Related Party Transaction
Due to affiliate	1.4	1.4
Tax Sharing Agreement \| Other Current Assets
Related Party Transaction
Due from affiliates	1.9	1.9
Tax Sharing Agreement \| Other Non-current Assets
Related Party Transaction
Due from affiliates	0.6	0.6
Transition Services Agreement
Related Party Transaction
Received from affiliate	3.7	3.9
Paid to affiliate	0.1	0.1
Equity Award Transactions
Related Party Transaction
Paid to affiliate	0.1	0.1
Health and Welfare and 401(k) Plans
Related Party Transaction
Accrued employee benefits	$ 1.4	$ 1.4

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them.

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