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Commitments and Contingent Liabilities (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jul. 31, 2017
Commitments and Contingent Liabilities [Line Items]
Litigation and regulatory matters loss contingency, range of possible loss, maximum (less than)	$ 100.0
Indonesia \| Joint Venture With CT Corp
Commitments and Contingent Liabilities [Line Items]
Joint Venture with CT Corp, Ownership Percentage			49.00%
Commitments \| Commercial mortgage loans
Commitments and Contingent Liabilities [Line Items]
Total outstanding commercial mortgage loan commitments	230.0	$ 270.0
Allowance for credit losses	0.3	0.3
Change in allowance for credit loss expense (reversal)	0.0	0.3
Commitments \| Investments
Commitments and Contingent Liabilities [Line Items]
Commitments to purchase investment (excluding commercial mortgage loans)	1,359.0	1,182.0
Purchase Commitment
Commitments and Contingent Liabilities [Line Items]
Change in allowance for credit loss expense (reversal)	0.0	0.0
Other Guarantees
Commitments and Contingent Liabilities [Line Items]
Accrued Liabilities	$ 32.0	$ 32.0