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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) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | $ 18,409.8 | [1]
Fair Value | 19,252.5 |
Amount at which shown in the balance sheet | 19,252.5 |
United States Government and government agencies and authorities |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 395.3 | [1]
Fair Value | 403.3 |
Amount at which shown in the balance sheet | 403.3 |
States, municipalities and political subdivisions |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 1,149.9 | [1]
Fair Value | 1,259.8 |
Amount at which shown in the balance sheet | 1,259.8 |
Foreign governments |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 13.1 | [1]
Fair Value | 12.9 |
Amount at which shown in the balance sheet | 12.9 |
Public utilities |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 1,822.2 | [1]
Fair Value | 1,922.4 |
Amount at which shown in the balance sheet | 1,922.4 |
All other corporate bonds |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 12,968.2 | [1]
Fair Value | 13,492.4 |
Amount at which shown in the balance sheet | 13,492.4 |
Redeemable preferred stock |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 120.0 | [1]
Fair Value | 120.7 |
Amount at which shown in the balance sheet | 120.7 |
Total fixed maturities |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 16,468.7 | [1]
Fair Value | 17,211.5 |
Amount at which shown in the balance sheet | 17,211.5 |
Banks, trust, and insurance companies |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 98.4 | [1]
Fair Value | 85.4 |
Amount at which shown in the balance sheet | 85.4 |
Industrial, miscellaneous and all other |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 141.2 | [1]
Fair Value | 104.5 |
Amount at which shown in the balance sheet | 104.5 |
Nonredeemable preferred stock |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 547.3 | [1]
Fair Value | 578.2 |
Amount at which shown in the balance sheet | 578.2 |
Total equity securities |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 786.9 | [1]
Fair Value | 768.1 |
Derivative investments |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 177.7 | [1]
Fair Value | 296.3 |
Amount at which shown in the balance sheet | 296.3 |
Asset-based loans |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 811.6 | [1]
Fair Value | 811.6 |
Amount at which shown in the balance sheet | 811.6 |
Policy loans |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 10.6 | [1]
Fair Value | 10.6 |
Amount at which shown in the balance sheet | 10.6 |
Other invested assets |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 154.3 | [1]
Fair Value | 154.4 |
Amount at which shown in the balance sheet | $ 154.4 |
[1] | 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 asset-based loans.

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- 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: 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=34726532&loc=d3e611379-123010 + Details
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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: 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=34726532&loc=d3e611379-123010 + Details
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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: 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=34726532&loc=d3e611379-123010 + Details
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