COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Undrawn capital commitments		$ 457.5	$ 453.5
Seed Capital Subject to MassMutual Redemption Agreement
Loss Contingencies [Line Items]
Seed capital subject to redemption agreement	$ 53.6	53.6
OppenheimerFunds Acquisition-related Matter
Loss Contingencies [Line Items]
Estimated liability recognized	254.3	254.3	387.8
Benefit to transaction, integration and restructuring expenses	45.7	131.1
Remediation costs	0.9	4.2	$ 11.6
Equity Commitment
Loss Contingencies [Line Items]
Maximum guarantee	30.0	30.0
Equity Commitment \| Maximum
Loss Contingencies [Line Items]
Commitments	$ 115.0	$ 115.0

Business Combination, Decrease In Expenses And Losses Recognized

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The company's investment may take the form of the general partner or a limited partner, and the entities are structured such that each partner makes capital commitments that may be drawn down over the life of the partnership as investment opportunities are identified.

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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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The amount of liabilities recognized recorded in a transaction with the acquiree for each transaction that is recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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