Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Taxes
Non-refundable tax credits	$ 25.0
Contingent liabilities	$ 0.0	$ 0.0		$ 0.0
Income tax benefit (expenses)		$ 41.4	$ (0.7)	$ 40.8	$ (1.4)
Effective tax rate compared		(15.20%)	(0.70%)	109.40%	(0.80%)