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Concentration Risk - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Concentration Risk [Line Items] |  |  |  |
Voluntary yield-related fee waivers | $ 0.0 | $ 109.2 | $ 85.3 | $ 310.2
Decrease in distribution expenses |  | 72.3 | 66.5 | 204.9
Net negative pre-tax impact |  | $ 36.9 | $ 18.8 | $ 105.3
Customer Concentration Risk | Revenue benchmark | Bank of New York Mellon Corporation |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk | 14.00% | 3.00% | 11.00% | 3.00%

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