Revenue Recognition - Timing of Transfer (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 2,673.8	$ 3,182.8	$ 2,826.0
Point in time
Disaggregation of Revenue [Line Items]
Revenues	1,689.1	1,962.7
Over time
Disaggregation of Revenue [Line Items]
Revenues	984.7	1,220.1
Advanced Process Solutions
Disaggregation of Revenue [Line Items]
Revenues	2,069.4	2,288.0
Advanced Process Solutions | Point in time
Disaggregation of Revenue [Line Items]
Revenues	1,118.3	1,137.1
Advanced Process Solutions | Over time
Disaggregation of Revenue [Line Items]
Revenues	951.1	1,150.9
Molding Technology Solutions
Disaggregation of Revenue [Line Items]
Revenues	604.4	894.8	$ 1,002.5
Molding Technology Solutions | Point in time
Disaggregation of Revenue [Line Items]
Revenues	570.8	825.6
Molding Technology Solutions | Over time
Disaggregation of Revenue [Line Items]
Revenues	$ 33.6	$ 69.2