Income Taxes - Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Current:
Federal	$ 0.0	$ 0.0	$ 0.0
State	0.1	0.0	0.0
Foreign	4.5	(1.7)	7.1
Total current	4.6	(1.7)	7.1
Deferred:
Federal	0.0	0.0	0.0
State	0.0	0.0	0.0
Foreign	0.0	0.0	0.0
Total deferred	0.0	0.0	0.0
Total income tax expense	$ 4.6	$ (1.7)	$ 7.1