Schedule of Participating Mortgage Loans by Internal Credit Rating and Loan to Value (Details) - USD ($) $ in Millions		Mar. 31, 2026	Dec. 31, 2025
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	[1]	$ 2,066.3	$ 2,109.5
Mortgage Loans, Percent of Total	[1]	100.00%	100.00%
Loan to Value Ratio Below or Equal to 65 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	[1]	$ 1,703.4	$ 1,701.2
Mortgage Loans, Percent of Total	[1]	82.50%	80.60%
Loan To Value Ratio Above 65 To 75 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	[1]	$ 151.3	$ 164.3
Mortgage Loans, Percent of Total	[1]	7.30%	7.80%
Loan To Value Ratio Above 75 To 85 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	[1]	$ 130.8	$ 162.6
Mortgage Loans, Percent of Total	[1]	6.30%	7.70%
Loan To Value Ratio Above 85 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	[1]	$ 80.8	$ 81.4
Mortgage Loans, Percent of Total	[1]	3.90%	3.90%
AA Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount		$ 128.5	$ 125.6
Mortgage Loans, Percent of Total		6.20%	6.00%
A Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount		$ 1,015.7	$ 1,053.4
Mortgage Loans, Percent of Total		49.10%	49.90%
BBB Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount		$ 819.3	$ 804.0
Mortgage Loans, Percent of Total		39.70%	38.10%
BB Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount		$ 97.0	$ 120.5
Mortgage Loans, Percent of Total		4.70%	5.70%
B Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount		$ 5.8	$ 6.0
Mortgage Loans, Percent of Total		0.30%	0.30%

[1] 1Loan-to-Value Ratio utilizes the most recent internal valuation of the property