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Concentration Risk - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Concentration Risk [Line Items]
Voluntary yield-related fee waivers	$ 117.8	$ 19.7	$ 200.9	$ 20.1
Decrease in distribution expenses	71.0	17.7	132.5	18.0
Net negative pre-tax impact	$ 46.8	$ 2.0	$ 68.4	$ 2.1
Customer Concentration Risk | Revenue benchmark | Bank of New York Mellon Corporation
Concentration Risk [Line Items]
Concentration risk	2.00%	8.00%	2.00%	10.00%

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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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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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