RELATED PARTIES - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Related Party Transactions [Line Items]
Due from affiliates	$ 781.7	$ 612.0
Due to affiliates	330.4	$ 171.6
Preferred Shares \| OppenheimerFunds
Related Party Transactions [Line Items]
Stock consideration	$ 4,000.0
MassMutual \| Preferred Shares \| OppenheimerFunds
Related Party Transactions [Line Items]
Approximate stake help in common stock of combined firm (percent)	16.40%

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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