Balance Sheet Accounts - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense for property and equipment				$ 22.2	$ 16.9	$ 10.7
Construction In Progress Reclassified To Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, reclassification	$ (162.7)		$ (10.6)
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, reclassification	162.7	$ 71.8	$ 10.6		4.2
Useful life			39 years	39 years
Construction In Progress Reclassified To Manufacturing Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, reclassification	(2.6)		$ (16.0)
Manufacturing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, reclassification	$ 2.6		$ 16.0
Manufacturing equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life			7 years	7 years
Manufacturing equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life			10 years	10 years
Manufacturing Facility
Property, Plant and Equipment [Line Items]
Useful life			39 years	39 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, reclassification		$ (71.8)			$ (4.2)