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Schedule I - Summary of Investments, Other Than Investments in Related Parties Schedule I - Summary of Investments, Other Than Investments in Related Parties (Details) $ in Millions	Sep. 30, 2016 USD ($)
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	$ 1,645.6	[1]
Fair Value	1,650.4
Amount at which shown in the balance sheet	1,650.4
Policy Loans [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	8.5	[1]
Fair Value	8.5
Amount at which shown in the balance sheet	8.5
United States Government and government agencies and authorities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	72.8	[1]
Fair Value	74.0
Amount at which shown in the balance sheet	74.0
States, municipalities and political subdivisions
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	61.6	[1]
Fair Value	66.4
Amount at which shown in the balance sheet	66.4
Foreign governments
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	2.6	[1]
Fair Value	2.8
Amount at which shown in the balance sheet	2.8
Public utilities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	146.8	[1]
Fair Value	145.5
Amount at which shown in the balance sheet	145.5
All other corporate bonds
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	881.7	[1]
Fair Value	887.8
Amount at which shown in the balance sheet	887.8
Mortgage Backed Securities, Other [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	357.5	[1]
Fair Value	350.4
Amount at which shown in the balance sheet	350.4
Total fixed maturities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	1,523.0	[1]
Fair Value	1,526.9
Amount at which shown in the balance sheet	1,526.9
Nonredeemable preferred stock
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	8.8	[1]
Fair Value	8.2
Amount at which shown in the balance sheet	8.2
Short-term Investments [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	95.5	[1]
Fair Value	95.5
Amount at which shown in the balance sheet	95.5
Other invested assets
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	0.0	[1]
Fair Value	0.0
Amount at which shown in the balance sheet	0.0
Derivative Financial Instruments, Assets [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	9.8	[1]
Fair Value	11.3
Amount at which shown in the balance sheet	$ 11.3
[1] (a)Represents (i) original cost reduced by repayments and other-than-temporary impairments and adjusted for amortization of premiums and accrual of discounts for fixed maturity securities, (ii) original cost reduced by other-than-temporary impairments for equity securities, (iii) original cost for derivative investments, and (iv) unpaid principal balance reduced by an allowance for credit losses for commercial-mortgage and asset-based loans.

X

- Definition

This element represents the carrying (reported) amount of the entity's investments as of the balance sheet date. This amount may represent the individual investment's or group of similar investments' original cost, fair value, or such other amount at which the investment is shown in the entity's balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010

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- Definition

This item represents the original cost of the entity's investments including investments in equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010

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- Definition

This item represents the reported amount of the entity's investments measured at fair value. Fair value is the price that would be received to sell an investment in an orderly transaction between market participants at the balance sheet [measurement] date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010

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+ References

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