Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 24.2	$ 14.9
Net Carrying Amount	5.5
Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	37.8	37.8
Intangible assets	13.6	22.9
Insurance licenses
Indefinite-Lived Intangible Assets [Line Items]
Intangible assets	7.5	7.5
Trademark
Indefinite-Lived Intangible Assets [Line Items]
Intangible assets	$ 0.6	0.6
Technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	3 years
Gross Carrying Amount	$ 28.0	28.0
Accumulated Amortization	22.5	13.2
Net Carrying Amount	$ 5.5	14.8
VOBA
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	6 months
Gross Carrying Amount	$ 1.7	1.7
Accumulated Amortization	1.7	1.7
Net Carrying Amount	$ 0.0	$ 0.0