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Concentration Risk - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Concentration Risk [Line Items] |  |  |  |
Voluntary yield-related fee waivers | $ 9.5 | $ 117.8 | $ 85.3 | $ 200.9
Decrease in distribution expenses | 9.0 | 71.0 | 66.5 | 132.5
Net negative pre-tax impact | $ 0.5 | $ 46.8 | $ 18.8 | $ 68.4
Customer Concentration Risk | Revenue benchmark | Bank of New York Mellon Corporation |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk | 12.00% | 2.00% | 9.00% | 2.00%

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