Leases - Summary of Maturities of Operating and Finance Lease Liabilities (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Operating Lease Liability, Payment Due [Abstract] | ||
| Less: Current portion of lease liabilities | $ (25.0) | $ (24.7) |
| Non-current lease liabilities | $ 53.7 | $ 53.5 |