Investment Portfolio Financing - Financial Covenant Compliance (Details) - Secured credit agreements - Holdco $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Debt Instrument [Line Items]
Minimum cash liquidity	$ 15.0
Minimum cash liquidity of recourse indebtedness	0.050
Tangible net worth	$ 1,000.0
Tangible net worth, amount of equity	0.75
Amount of redeemed or repurchased equity	0.75
Debt to equity ratio	4.25
Interest coverage, minimum	1.4
Interest coverage, maximum	1.5