SIGNIFICANT TRANSACTIONS - Reinsurance and Financing Transaction (Details) - USD ($) $ in Millions		12 Months Ended
Jan. 15, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Increase in total assets		$ 2,800.0
Increase in total liabilities		2,800.0
Increase in assets resulting from reinsurance transaction		600.0
Increase in value of business acquired		280.0
Increase in assets associated with financing transactions		$ 2,200.0
Golden Gate
Debt Instrument [Line Items]
Extraordinary dividend	$ 300.0
Financing Agreement With Golden Gate And Syndicate Of Risk Takers
Debt Instrument [Line Items]
Term of financing agreement	18 years
Financing capacity under the agreement	$ 2,188.0
Steel City Notes \| Golden Gate \| Surplus Notes
Debt Instrument [Line Items]
Amount of debt issued	2,188.0
Golden Gate Surplus Notes \| Steel City \| Surplus Notes
Debt Instrument [Line Items]
Amount of debt issued	2,188.0
Series Of Non Recourse Funding Obligations \| Golden Gate
Debt Instrument [Line Items]
Outstanding non-recourse funding obligations	$ 800.0

Extraordinary Dividend

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- Definition

Total non-recourse funding obligations issued by special purpose entities owned by the reporting entity, including amounts held by affiliates and by external parties. The funding obligations are direct financial obligations of the special purpose entity and are not guaranteed by the reporting entity.

+ References

No definition available.

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- Definition

Reinsurance Financing Agreement Capacity

+ References

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- Definition

Reinsurance Transaction Increase in Assets Resulting from Reinsurance Transaction

+ References

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- Definition

Reinsurance Transaction Increase in Assets Resulting from Reinsurance Transaction Increase in Value of Business Acquired

+ References

No definition available.

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- Definition

Reinsurance Transaction Increase in Liabilities Associated with Financing Transactions

+ References

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- Definition

Reinsurance Transaction, Increase in Total Assets

+ References

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- Definition

Reinsurance Transaction, Increase in Total Liabilities

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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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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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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