Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities.

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The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date.

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Commitments and Contingent Liabilities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Jul. 31, 2017
Commitments and Contingent Liabilities [Line Items]
Litigation and regulatory matters loss contingency, range of possible loss, maximum (less than)	$ 100.0		$ 100.0
Indonesia \| CT Corp Joint Venture
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 mortgage loan commitments	695.0		695.0		$ 230.0
Allowance for credit losses	0.1		0.1		0.3
Change in allowance for credit loss expense (reversal)	0.1	$ 0.0	0.2	$ 0.1
Commitments \| Investments
Commitments and Contingent Liabilities [Line Items]
Commitments to purchase investment (excluding commercial mortgage loans)	1,717.0		1,717.0		1,359.0
Purchase Commitment
Commitments and Contingent Liabilities [Line Items]
Change in allowance for credit loss expense (reversal)	0.0	$ 0.0	0.0	$ 0.0
Other Guarantees
Commitments and Contingent Liabilities [Line Items]
Accrued liabilities	$ 31.0		$ 31.0		$ 32.0