Amount of gain (loss) included in earnings for investments classified as other.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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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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Percentage of Business Recaptured

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Reinsurance - Narrative (Details) - USD ($) $ in Millions					12 Months Ended
Reinsurance - Narrative (Details) - USD ($) $ in Millions	Oct. 01, 2015	Apr. 01, 2015	Oct. 01, 2014	Oct. 01, 1998	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jan. 01, 2009
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Revolving lines of credit, capacity					$ 6,872.0
Reinsurance recoverable					7,566.0	$ 7,228.0
Net realized capital losses					227.0	363.0	$ 560.0
Other net realized capital gains (losses)					(206.0)	(329.0)	(477.0)
Operating expenses					2,654.0	2,655.0	2,684.0
Unsecured and Committed
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Revolving lines of credit, capacity					6,171.0
Unsecured and Committed \| Voya Financial, Inc. / Security Life of Denver International Limited
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Revolving lines of credit, capacity								$ 2,900.0
Lincoln National Corporation, subsidiary
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance recoverable					1,500.0	1,600.0
Disposal of life insurance business				$ 1,000.0
Scottish Re
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Percentage of business recaptured									100.00%
Hannover Re \| Customer concentration risk
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance recoverable					2,900.0	1,900.0
RGA Reinsurance Group
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Disposal of life insurance business	$ 419.0		$ 448.0
Net realized capital losses							110.0
Other net realized capital gains (losses)							14.0
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net							4.0
Operating expenses							$ 120.0
RGA Reinsurance Group \| Term Life Coinsurance Agreement, effective October 1, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance recoverable					542.0	499.0
RGA Reinsurance Group \| Term Life Coinsurance Agreement, effective October 1, 2015
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance recoverable					458.0	452.0
Enstar
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance recoverable					$ 164.0	$ 198.0
Disposal of life insurance business		$ 305.0
Net realized capital losses		$ (39.0)