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

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Business Combination, Equity Consideration Transferred, Lock-up Period

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Business Combination, Equity Interest Issued or Issuable, Preferred Stock, Liquidation Preference Per Share

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- Definition

Business Combination, Provisional Information, Initial Accounting Incomplete, Liability

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- Definition

Total Transaction And Integration Charges

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- Definition

Number of shares of equity interests issued or issuable to acquire entity.

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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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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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- Definition

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

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of (increase) decrease to an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from the subsequent recognition of deferred tax assets.

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Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

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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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The percentage rate used to calculate dividend payments on preferred stock.

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Business Combinations (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	12 Months Ended			19 Months Ended
	May 24, 2019	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Business Acquisition [Line Items]
Finite-lived intangible assets acquired				$ 315.4
Transaction, integration and restructuring			$ 393.3	673.0	$ 136.9
OppenheimerFunds Acquisition
Business Acquisition [Line Items]
Cash consideration						$ 35.0
Fixed rate on preferred stock (percent)			5.90%
Estimated liability recorded		$ 380.5
Goodwill adjustments		287.0
Deferred tax asset		$ 93.5
Transaction, integration and restructuring			$ 221.3	625.0
Preferred Shares \| OppenheimerFunds Acquisition
Business Acquisition [Line Items]
Stock consideration (shares)						4,010,448
Stock and other consideration			$ 4,000.0			$ 4,010.5
Preferred stock fair value per share (in usd per share)	$ 1,000
Preferred Shares \| OppenheimerFunds Acquisition \| MassMutual
Business Acquisition [Line Items]
Stake in common stock of combined frim (percent)			16.50%			16.50%
Common stock \| OppenheimerFunds Acquisition
Business Acquisition [Line Items]
Stock and other consideration						$ 1,453.6
Lock-up period						2 years
Performance-vested awards \| OppenheimerFunds Acquisition
Business Acquisition [Line Items]
Stock consideration (shares)	6,200,000
Trade names \| OppenheimerFunds Acquisition
Business Acquisition [Line Items]
Intangible assets, useful life, years						6 years
Management contracts \| OppenheimerFunds Acquisition
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired				4,907.0
Finite-lived intangible assets acquired				$ 255.0
Intangible assets, useful life, years						8 years
MassMutual \| Common stock \| OppenheimerFunds Acquisition
Business Acquisition [Line Items]
Stock consideration (shares)	75,563,041
Market price ( in usd per share)	$ 19.195
Others \| Common stock \| OppenheimerFunds Acquisition
Business Acquisition [Line Items]
Stock consideration (shares)	153,574
Market price ( in usd per share)	$ 20.42