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Schedule of Net Unrealized Gain on Securities (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Debt Securities [Member] | Dec. 31, 2012 Debt Securities [Member] | Mar. 31, 2013 Other Investments [Member] | Dec. 31, 2012 Other Investments [Member] | Mar. 31, 2013 Deferred Acquisition Costs [Member] | Dec. 31, 2012 Deferred Acquisition Costs [Member] | Mar. 31, 2013 Reserve for Future Policy and Contract Benefits [Member] | Dec. 31, 2012 Reserve for Future Policy and Contract Benefits [Member] | Mar. 31, 2013 Reinsurance Recoverable [Member] | Dec. 31, 2012 Reinsurance Recoverable [Member] | Mar. 31, 2013 Deferred Income Tax Charges [Member] | Dec. 31, 2012 Deferred Income Tax Charges [Member] | Mar. 31, 2013 Includes Unrealized Adjustment for Deferred Policy Acquisition Costs and Reserves for Future Policy and Contract Benefits [Member] | Dec. 31, 2012 Includes Unrealized Adjustment for Deferred Policy Acquisition Costs and Reserves for Future Policy and Contract Benefits [Member]
Schedule of Net Unrealized Gain on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  |  | $ 6,803.9 | $ 7,221.5 | $ 72.5 | $ 92.8 | $ (61.2) | $ (67.0) | $ (5,979.7) | $ (6,277.5) | $ 353.9 | $ 351.5 | $ (397.0) | $ (447.8) | $ 792.4 | $ 873.5
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | $ (278.5) | $ (197.2) | $ (417.6) |  | $ (20.3) |  | $ 5.8 |  | $ 297.8 |  | $ 2.4 |  | $ 50.8 |  | $ (81.1) |

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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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- Definition Net of tax amount of the appreciation (loss) in the value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 + Details
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