Investments - Schedule of Loans by Ratio (Details) $ in Millions	Sep. 30, 2024 USD ($) loan	Dec. 31, 2023 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at cost | $	$ 234.9	$ 144.8
Loan Count | loan	17	28
Excluding Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at cost | $	$ 223.3
Loan Count | loan	16
Equal to or less than 50.0%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at cost | $		$ 12.3
Loan Count | loan		2
Greater than 50.0% to 55.0%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at cost | $	$ 83.3	$ 9.1
Loan Count | loan	3	2
Greater than 55.0% to 60.0%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at cost | $	$ 11.8	$ 18.9
Loan Count | loan	2	4
Greater than 60.0% to 70.0%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at cost | $	$ 52.0	$ 37.3
Loan Count | loan	3	6
Greater than 70.0%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at cost | $	$ 87.8	$ 67.2
Loan Count | loan	9	14
Less than 1.00
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at cost | $	$ 10.4	$ 36.2
Loan Count | loan	1	8
1.00 to 1.50
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at cost | $	$ 29.5	$ 29.4
Loan Count | loan	5	6
Greater than 1.5 to 2.0
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at cost | $	$ 133.5	$ 30.9
Loan Count | loan	6	6
Greater than 2.0 to 3.0
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at cost | $	$ 23.8	$ 36.0
Loan Count | loan	2	6
Greater than 3.0 to 4.0
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at cost | $	$ 26.1	$ 12.3
Loan Count | loan	2	2