BUSINESS AND BASIS OF PRESENTATION - Narrative (Details) - Strategic Wealth Group, LLC [Member] $ in Millions	9 Months Ended
Sep. 30, 2021 USD ($)
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Apr. 30, 2021
Payments to Acquire Businesses, Gross	$ 4.4
Intangible asset acquired	1.6
Goodwill acquired	$ 2.8

Date when the acquirer obtains control of the acquiree, in YYYY-MM-DD format.

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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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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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