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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	$ 14.3	$ 1.1	$ 1.3
Permanent items	(0.5)	(0.5)	(0.6)
Foreign rate differential	0.0	0.6	0.3
Stock-based compensation	2.3	1.3	1.2
Tax credits	(2.1)	(4.7)	(8.0)
Change in U.S. valuation allowance	(0.2)	(26.3)	20.0
Tax contingency and interest	1.1	1.5	1.9
State taxes	4.8	1.7	2.2
Other	(0.2)	(0.1)	(0.2)
Tax at effective tax rate	$ (19.5)	$ 25.4	$ (18.1)

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