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Concentration Risk - Narrative (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Voluntary yield-related fee waivers	$ 56.1	$ 36.8	$ 19.7	$ 0.4	$ 113.0
Reduction in distribution expenses	47.4	33.0	17.7	0.3	98.4
Net negative pre-tax impact	$ 8.7	$ 3.8	$ 2.0	$ 0.1	$ 14.6
Customer Concentration Risk | The Bank of New York Mellon Corporation
Concentration Risk [Line Items]
Concentration risk					7.00%	11.00%	13.00%

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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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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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