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Concentration Risk - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Concentration Risk [Line Items]
Voluntary yield-related fee waivers	$ 109.2	$ 36.8	$ 310.2	$ 56.9
Decrease in distribution expenses	72.3	33.0	204.9	51.0
Net negative pre-tax impact	$ 36.9	$ 3.8	$ 105.3	$ 5.9

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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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