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v3.22.1

Basis of Presentation and Consolidation and Accounting Standards Adopted (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) | Mar. 31, 2022 USD ($) client country | Mar. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) client country | Mar. 31, 2021 USD ($) | Sep. 30, 2021 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Number of countries in which entity operates | country |  | 180 |  | 180 |  |
Number of commercial and institutional clients | client |  | 52,000 |  | 52,000 |  |
Number retail clients | client |  | 370,000 |  | 370,000 |  |
Cumulative-effect adjustment, net of tax |  | $ 788.2 |  | $ 788.2 |  | $ 682.5
Income tax expense |  | $ 23.4 | $ 21.0 | $ 34.2 | $ 28.4 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Cumulative-effect adjustment, net of tax | $ (6.2) |  |  |  |  |
Income tax expense | $ 2.0 |  |  |  |  |
Retail Segment |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Number of countries in which entity operates | country |  | 180 |  | 180 |  |

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