Revenue - Performance Obligations and Contract Estimates (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2026 |
|
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | |||
| Standard assurance warranty, period | 1 year | ||
| Remaining performance obligation, amount | $ 1,800.0 | $ 1,800.0 | |
| Changes in contract estimates related to projects in progress | 14.2 | $ 8.8 | |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-04-01 | |||
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | |||
| Remaining performance obligation, amount | $ 1,100.0 | $ 1,100.0 | |
| Remaining performance obligation, expected timing of satisfaction, period | 12 months | 12 months | |