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Investments - Fair Value of Investments on Deposit with Governmental Authorities - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Investments Debt And Equity Securities [Abstract]
Fair values of investments on deposit	$ 19.4	$ 18.1

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- Definition

Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 320
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=28366721&loc=d3e22002-158495

+ Details

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Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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