Funds Payable and Amounts Due to Customers - Summary of Funds Payable and Amount Due to Customers (Detail) - USD ($) $ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Funds Payable And Amounts Due To Customers [Abstract] | ||
| Outstanding money transmission liabilities | $ 295.5 | $ 243.9 |
| Customer balances | 29,958.7 | 22,036.0 |
| Funds payable and amounts due to customers | $ 30,254.2 | $ 22,279.9 |