Intangible Assets - Schedule of intangible assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 5.3	$ 0.0
Net Carrying Amount	24.4
Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	37.8	0.6
Intangible assets	32.5	0.6
Insurance licenses
Indefinite-Lived Intangible Assets [Line Items]
Intangible assets	7.5	0.0
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	0.0
Accumulated Amortization	3.9	0.0
Net Carrying Amount	$ 24.1	0.0
VOBA
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	6 months
Gross Carrying Amount	$ 1.7	0.0
Accumulated Amortization	1.4	0.0
Net Carrying Amount	$ 0.3	$ 0.0