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Intangible Assets and Goodwill - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2025	Sep. 30, 2025
Advanced Process Solutions
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 623.3	$ 638.1
Indefinite-lived assets:	115.0	114.8
Molding Technology Solutions
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	302.3	306.2
Indefinite-lived assets:	$ 60.5	$ 60.5
Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	21 years

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