Revenue - Performance Obligations and Contract Estimates (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Standard assurance warranty, period	1 year
Remaining performance obligation, amount	$ 1,300.0
Changes in contract estimates related to projects in progress	7.8	$ 7.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 733.0
Remaining performance obligation, expected timing of satisfaction, period	12 months