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Concentration Risk - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Concentration Risk [Line Items]
Voluntary yield-related fee waivers	$ 0	$ 75,800,000
Decrease in distribution expenses		57,500,000
Net negative pre-tax impact		$ 18,300,000
Customer Concentration Risk | Revenue benchmark | Bank of New York Mellon Corporation
Concentration Risk [Line Items]
Concentration risk	13.00%	5.00%

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- Definition

Decrease In Distribution Expenses

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- Definition

Fee Waivers Net Of Distribution Expenses

+ References

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- Definition

Voluntary Yield-related Fee Waivers

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- Definition

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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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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