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Financial Instruments and Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Concentration Risk [Line Items]
Interest income	$ 0.7	$ 1.3	$ 1.6	$ 3.1
Impairment of property, plant and equipment			$ 0.5	10.4
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold
Concentration Risk [Line Items]
Impairment of property, plant and equipment				6.1
Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpense
Concentration Risk [Line Items]
Impairment of property, plant and equipment				$ 4.3
Customer Concentration Risk \| Revenues \| Three Customers
Concentration Risk [Line Items]
Concentration risk percentage	39.10%		38.00%
Customer Concentration Risk \| Trade Receivables \| Customer One
Concentration Risk [Line Items]
Concentration risk percentage	14.80%