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Concentration Risk - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Voluntary yield-related fee waivers	$ 420.3
Reduction in distribution expenses	277.1
Net negative pre-tax impact	$ 143.2
Customer Concentration Risk | Revenue benchmark | Bank of New York Mellon Corporation
Concentration Risk [Line Items]
Concentration risk	3.00%	7.00%	11.00%

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Decrease In Distribution Expenses

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Fee Waivers Net Of Distribution Expenses

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Voluntary Yield-related Fee Waivers

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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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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.

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