Schedule of Participating Mortgage Loans by Internal Credit Rating and Loan to Value (Details) - USD ($) $ in Millions		Jun. 30, 2026	Dec. 31, 2025
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	[1]	$ 2,071.7	$ 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]	$ 1,706.6	$ 1,701.2
Mortgage Loans, Percent of Total	[1]	82.40%	80.60%
Loan To Value Ratio Above 65 To 75 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	[1]	$ 186.1	$ 164.3
Mortgage Loans, Percent of Total	[1]	9.00%	7.80%
Loan To Value Ratio Above 75 To 85 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	[1]	$ 99.6	$ 162.6
Mortgage Loans, Percent of Total	[1]	4.80%	7.70%
Loan To Value Ratio Above 85 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	[1]	$ 79.4	$ 81.4
Mortgage Loans, Percent of Total	[1]	3.80%	3.90%
AA Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount		$ 112.2	$ 125.6
Mortgage Loans, Percent of Total		5.40%	6.00%
A Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount		$ 1,027.2	$ 1,053.4
Mortgage Loans, Percent of Total		49.60%	49.90%
BBB Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount		$ 831.1	$ 804.0
Mortgage Loans, Percent of Total		40.10%	38.10%
BB Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount		$ 95.6	$ 120.5
Mortgage Loans, Percent of Total		4.60%	5.70%
B Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount		$ 5.6	$ 6.0
Mortgage Loans, Percent of Total		0.30%	0.30%

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