Amounts Related to Cumulative Basis Adjustments for Fair Value Hedges (Detail) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||
| Carrying amount of the hedged liabilities | $ 1,300.8 | $ 753.7 |
| Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Notes Payable | Notes Payable |
| Cumulative basis adjustment increase included in the carrying amount | $ (31.5) | $ 3.9 |