Restructuring Activity (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2025	Dec. 31, 2024
Restructuring Cost and Reserve [Line Items]
Reduction in workforce (as a percent)	15.00%		33.00%
Restructuring charges (income)		$ (0.2)		$ 0.7
Restructuring accrual	$ 4.1	4.1		4.1	$ 0.0
Research and Development Expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges (income)		0.4		1.0
General and Administrative Expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges (income)		(0.6)		(0.3)
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges (income)		4.1		11.4
Stock Compensation And Bonus Expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges (income)		$ 4.3		$ 10.7