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Fair Values of Financial Instruments Carrying Amounts and Estimated Fair value of Financial Instruments Not Measured at Fair Value (Details) - USD ($)
$ in Millions

Sep. 30, 2025

Dec. 31, 2024

Fair Value, Balance Sheet Grouping, Financial Statement Captions

Mortgage Loans, Carrying Amount

^[1],[2]

$ 2,129.8

$ 2,224.5

Policy Loans

3,584.1

3,617.2

Long-term Debt

3,470.8

3,465.2

Liabilities, Fair Value Disclosure

259.6

255.7

Fair Value, Nonrecurring

Fair Value, Balance Sheet Grouping, Financial Statement Captions

Mortgage Loans, Fair Value Disclosure

1,977.5

1,975.4

Mortgage Loans, Carrying Amount

2,129.8

2,224.5

Policy Loans, Fair Value Disclosure

3,653.4

3,672.9

Policy Loans

3,584.1

3,617.2

Miscellaneous Long-Term Investments, Fair Value Disclosure

38.2

26.9

Miscellaneous Long-Term Investments, Carrying Value

38.2

26.9

Financial Instruments, Financial Assets Fair Value Disclosure

5,669.1

5,675.2

Total Financial Instrument Assets Not Carried at Fair Value

5,752.1

5,868.6

Long-term Debt, Fair Value Disclosure

3,380.8

3,289.3

Long-term Debt

3,470.8

3,465.2

Unfunded Commitments

0.2

0.2

Federal Home Loan Bank Funding Agreements, Fair Value Disclosure

585.4

324.2

Payables for Collateral on Investments

585.4

324.2

Liabilities, Fair Value Disclosure

3,966.4

3,613.7

Total Financial Instrument Liabilities Not Carried at Fair Value

4,056.4

3,789.6

Fair Value, Inputs, Level 1 | Fair Value, Nonrecurring

Fair Value, Balance Sheet Grouping, Financial Statement Captions

Mortgage Loans, Fair Value Disclosure

0.0

0.0

Policy Loans, Fair Value Disclosure

0.0

0.0

Miscellaneous Long-Term Investments, Fair Value Disclosure

0.0

0.0

Financial Instruments, Financial Assets Fair Value Disclosure

0.0

0.0

Long-term Debt, Fair Value Disclosure

3,032.8

3,246.1

Unfunded Commitments

0.0

0.0

Federal Home Loan Bank Funding Agreements, Fair Value Disclosure

0.0

0.0

Liabilities, Fair Value Disclosure

3,032.8

3,246.1

Fair Value, Inputs, Level 2 | Fair Value, Nonrecurring

Fair Value, Balance Sheet Grouping, Financial Statement Captions

Mortgage Loans, Fair Value Disclosure

1,977.5

1,975.4

Policy Loans, Fair Value Disclosure

0.0

0.0

Miscellaneous Long-Term Investments, Fair Value Disclosure

38.0

26.7

Financial Instruments, Financial Assets Fair Value Disclosure

2,015.5

2,002.1

Long-term Debt, Fair Value Disclosure

348.0

43.2

Unfunded Commitments

0.2

0.2

Federal Home Loan Bank Funding Agreements, Fair Value Disclosure

585.4

324.2

Liabilities, Fair Value Disclosure

933.6

367.6

Fair Value, Inputs, Level 3 | Fair Value, Nonrecurring

Fair Value, Balance Sheet Grouping, Financial Statement Captions

Mortgage Loans, Fair Value Disclosure

0.0

0.0

Policy Loans, Fair Value Disclosure

3,653.4

3,672.9

Miscellaneous Long-Term Investments, Fair Value Disclosure

0.2

0.2

Financial Instruments, Financial Assets Fair Value Disclosure

3,653.6

3,673.1

Long-term Debt, Fair Value Disclosure

0.0

0.0

Unfunded Commitments

0.0

0.0

Federal Home Loan Bank Funding Agreements, Fair Value Disclosure

0.0

0.0

Liabilities, Fair Value Disclosure

$ 0.0

$ 0.0

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

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