Investments - Schedule of Loans by Debt Service Covenant Ratio (Details) $ in Millions	Dec. 31, 2024 USD ($) loan	Dec. 31, 2023 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost	$ 787.4	$ 144.8
Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost	$ 210.1	$ 144.8
Loan Count | loan	17	28
Excluding Residential | Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost	$ 197.6
Loan Count | loan	16
Equal to or less than 50.0% | Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost	$ 1.7	$ 12.3
Loan Count | loan	2	2
Greater than 50.0% to 55.0% | Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost	$ 43.2	$ 9.1
Loan Count | loan	1	2
Greater than 55.0% to 60.0% | Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost	$ 12.4	$ 18.9
Loan Count | loan	1	4
Greater than 60.0% to 70.0% | Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost	$ 47.6	$ 37.3
Loan Count | loan	4	6
Greater than 70.0% | Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost	$ 105.2	$ 67.2
Loan Count | loan	9	14
Less than 1.00 | Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost	$ 12.2	$ 36.2
Loan Count | loan	3	8
1.00 to 1.50 | Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost	$ 37.1	$ 29.4
Loan Count | loan	4	6
Greater than 1.5 to 2.0 | Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost	$ 135.7	$ 30.9
Loan Count | loan	8	6
Greater than 2.0 to 3.0 | Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost	$ 12.6	$ 36.0
Loan Count | loan	1	6
Greater than 3.0 to 4.0 | Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost		$ 12.3
Loan Count | loan		2