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Statutory Requirements and Dividends Restrictions - Additional Information (Details) - 12 months ended Dec. 31, 2017 £ in Millions, $ in Millions	USD ($)	GBP (£)
AUL
Statutory Accounting Practices [Line Items]
Syndicate to maintain funds at Lloyd	$ 451.8
Total funds held by AUL	458.7
U.K.
Statutory Accounting Practices [Line Items]
Dividend payment made without regulatory approval	(196.3)	£ (35.9)
Capital contributions reserves	470.0
Bermuda
Statutory Accounting Practices [Line Items]
Dividend payment made without regulatory approval	$ (448.3)
Statutory capital and surplus, percent	25.00%
Statutory capital and surplus, percent reduction requiring approval	15.00%
Percent warning level of amount of enhanced capital required from statutory capital and surplus	120.00%
Bermuda | AUL
Statutory Accounting Practices [Line Items]
Total funds held by AUL	$ 423.6

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- Definition

Capital Reserves

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- Definition

Dividend Payments Restrictions Schedule, Statutory Capital and Surplus, Percent

+ References

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- Definition

Funds maintained at syndicate.

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- Definition

Percent Warning Level of Amount of Enhanced Capital Required from Statutory Capital and Surplus

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- Definition

Statutory Capital and Surplus, Percent Requiring Approval

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- Definition

Carrying amount as of the balance sheet date of the funds held on behalf of others and that are expected to be liquidated within one year or the normal operating cycle, if longer. This does not include funds held under reinsurance agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

Amount of dividends that can be declared or paid without approval of regulatory agency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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