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Statutory Restrictions on Consolidated Stockholders' Equity and Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statutory Restrictions on Consolidated Stockholders' Equity and Investments [Abstract]
Combined capital and surplus on statutory basis	$ 180.2	$ 171.9
Net income statutory basis	41.0	18.8	$ 17.9
Statutory accounting statutory premium and supplemental reserves	35.9	57.3
Amount available for dividend distribution with approval from regulatory agencies	81.8	102.1
Statutory accounting practices, statutory amount available for dividend payments	45.4
Investments on deposit with state insurance departments	$ 6.7	$ 7.1

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- Definition

Statutory accounting statutory premium and supplemental reserves

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Statutory Restrictions on Consolidated Stockholders' Equity and Investments [Abstract]

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 825
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=75763970&loc=SL75763979-209797

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Amount of dividends available for payment after computation of statutory restrictions on capital surplus.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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Amount of dividends that can be declared or paid with approval of regulatory agency.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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-Section 50
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Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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