Related Parties - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2021	Dec. 31, 2020
Related Party Transactions [Line Items]
Due from Affiliates	$ 822.6	$ 612.0
Due to Affiliate	368.9	$ 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)	16.50%

Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Percent

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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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For an unclassified balance sheet, amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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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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