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Concentration Risk - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Concentration Risk [Line Items]
Voluntary yield-related fee waivers	$ 75.8	$ 83.1
Decrease in distribution expenses	57.5	61.4
Net negative pre-tax impact	$ 18.3	$ 21.7

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- Definition

Decrease In Distribution Expenses

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- Definition

Fee Waivers Net Of Distribution Expenses

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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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