The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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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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Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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Commitments and Contingent Liabilities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	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
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	37.0	37.0	$ 26.0
Allowance for credit losses	0.0	0.0
Change in allowance for credit losses	0.0	0.0
Commitments \| Investments
Commitments and Contingent Liabilities [Line Items]
Commitments to Purchase Investment (excluding Commercial Mortgage Loans)	357.0	357.0	$ 261.0
Purchase Commitment
Commitments and Contingent Liabilities [Line Items]
Change in allowance for credit losses	$ 0.0	$ 0.0