Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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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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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Intangible Assets (Narrative) (Details) - USD ($)	12 Months Ended			19 Months Ended
Intangible Assets (Narrative) (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 315,400,000
Weighted average amortization period (years)		7 years 1 month 24 days
Impairment of intangible asset	$ 0	$ 0
Amortization expense	$ 62,500,000	52,700,000	$ 29,700,000
OppenheimerFunds \| Management Contracts
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets acquired		4,907,000,000.0
Finite-lived intangible assets acquired		255,000,000.0
OppenheimerFunds \| Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 27,000,000.0		$ 27,000,000.0