Financing and Other Debt - Schedule of Short Term Debt (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Securitized debt	$ 723.0	$ 202.6
Unamortized debt issuance costs/discounts	(10.3)	(10.3)
Current portion of long-term debt (net of $10.3 million in unamortized debt issuance costs/discounts)	53.0	53.1
Participation debt
Debt Instrument [Line Items]
Securitized debt	$ 53.9	$ 39.0
Interest rate during period (as a percent)	7.48%	6.64%
Borrowed federal funds
Debt Instrument [Line Items]
Securitized debt	$ 520.2	$ 0.0
Interest rate during period (as a percent)	5.39%	0.00%
Secured Debt
Debt Instrument [Line Items]
Securitized debt	$ 95.9	$ 110.6
Interest rate during period (as a percent)	5.36%	3.83%