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Quantitative Information Regarding Significant Unobservable Inputs (Details) (Fair Value, Inputs, Level 3 [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Embedded Derivative Financial Instruments [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Measurements, Significant Assumptions | Actuarial Assumptions | [1] | Actuarial Assumptions | [1]
Embedded Derivative, Fair Value of Embedded Derivative Liability | $ (77.5) |  | $ (83.9) |
Fair Value Measurements, Valuation Techniques | - Projected Liability Cash Flows |  | - Projected Liability Cash Flows |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Measurements, Significant Assumptions | 0.25% - 1.25% / 0.74% |  | 0.25% - 0.25% / 0.25% 0.25% - 0.25% / 0.25% 0.15% - 0.15% / 0.15% |
Fair value of fixed maturity securities | 126.5 |  | 42.7 |
Fair Value Measurements, Valuation Techniques | - Comparability Adjustment |  | - Comparability Adjustment - Lack of Marketability - Volatility of Credit |
US States and Political Subdivisions Debt Securities [Member] | Minimum [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 0.25% | [2] | 0.25% | [2]
Fair Value Inputs, Entity Credit Risk |  |  | 0.15% | [3]
Fair Value Inputs, Discount for Lack of Marketability |  |  | 0.25% | [4]
US States and Political Subdivisions Debt Securities [Member] | Maximum [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 1.25% | [2] | 0.25% | [2]
Fair Value Inputs, Entity Credit Risk |  |  | 0.15% | [3]
Fair Value Inputs, Discount for Lack of Marketability |  |  | 0.25% | [4]
US States and Political Subdivisions Debt Securities [Member] | Weighted Average [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 0.74% | [2] | 0.25% | [2]
Fair Value Inputs, Entity Credit Risk |  |  | 0.15% | [3]
Fair Value Inputs, Discount for Lack of Marketability |  |  | 0.25% | [4]
Public Utilities |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Measurements, Significant Assumptions | 0.25% - 0.30% / 0.27% 0.25% - 0.25% / 0.25% |  | 0.20% - 0.20% / 0.20% |
Fair value of fixed maturity securities | 89.2 |  | 17.4 |
Fair Value Measurements, Valuation Techniques | - Comparability Adjustment - Volatility of Credit |  | - Comparability Adjustment |
Public Utilities | Minimum [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 0.25% | [2] | 0.20% | [2]
Fair Value Inputs, Entity Credit Risk | 0.25% | [3] |  |
Public Utilities | Maximum [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 0.30% | [2] | 0.20% | [2]
Fair Value Inputs, Entity Credit Risk | 0.25% | [3] |  |
Public Utilities | Weighted Average [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 0.27% | [2] | 0.20% | [2]
Fair Value Inputs, Entity Credit Risk | 0.25% | [3] |  |
Asset-backed Securities [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Measurements, Significant Assumptions | 5.76% - 5.86% / 5.84% |  | 5.74% - 5.84% / 5.81% |
Fair value of fixed maturity securities | 0.5 |  | 0.5 |
Fair Value Measurements, Valuation Techniques | - Discount for Size |  | - Discount for Size |
Asset-backed Securities [Member] | Minimum [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Discount for Size | 5.76% | [5] | 5.74% | [5]
Asset-backed Securities [Member] | Maximum [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Discount for Size | 5.86% | [5] | 5.84% | [5]
Asset-backed Securities [Member] | Weighted Average [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Discount for Size | 5.84% | [5] | 5.81% | [5]
All Other Corporate Bonds - Private |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Measurements, Significant Assumptions | 0.75% - 3.20% / 1.07% (0.54)% - (0.08)% / (0.37)% 0.50% - 0.50% / 0.50% 0.50% - 1.00% / 0.76% 0.50% - 7.72% / 1.60% Priced at Par |  | 0.04% - 2.89% / 0.28% 1.48% - 1.48% / 1.48% 0.10% - 0.50% / 0.24% 0.10% - 1.00% / 0.46% (0.25)% -7.72% / 1.51% Priced at Par |
Fair value of fixed maturity securities | 237.5 |  | 391.8 |
Fair Value Measurements, Valuation Techniques | - Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention |  | - Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention |
All Other Corporate Bonds - Private | Market Convention [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Measurements, Significant Assumptions | Priced at Par | [6] | Priced at Par | [6]
All Other Corporate Bonds - Private | Minimum [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | (0.54%) | [2] | 1.48% | [2]
Fair Value Inputs, Entity Credit Risk | 0.50% | [3] | (0.25%) | [3]
Fair Value Inputs, Discount for Size | 0.50% | [5] | 0.10% | [5]
Fair Value Inputs, Change in Benchmark Reference | 0.75% | [7] | 0.04% | [7]
Fair Value Inputs, Discount for Lack of Marketability | 0.50% | [4] | 0.10% | [4]
All Other Corporate Bonds - Private | Maximum [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | (0.08%) | [2] | 1.48% | [2]
Fair Value Inputs, Entity Credit Risk | 7.72% | [3] | 7.72% | [3]
Fair Value Inputs, Discount for Size | 0.50% | [5] | 0.50% | [5]
Fair Value Inputs, Change in Benchmark Reference | 3.20% | [7] | 2.89% | [7]
Fair Value Inputs, Discount for Lack of Marketability | 1.00% | [4] | 1.00% | [4]
All Other Corporate Bonds - Private | Weighted Average [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | (0.37%) | [2] | 1.48% | [2]
Fair Value Inputs, Entity Credit Risk | 1.60% | [3] | 1.51% | [3]
Fair Value Inputs, Discount for Size | 0.50% | [5] | 0.24% | [5]
Fair Value Inputs, Change in Benchmark Reference | 1.07% | [7] | 0.28% | [7]
Fair Value Inputs, Discount for Lack of Marketability | 0.76% | [4] | 0.46% | [4]
Corporate Bond Securities - Public |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Measurements, Significant Assumptions | (0.88)% - (0.88)% / (0.88)% (0.30)% - 1.00% / 0.10% (0.57)% - (0.57)% / (0.57)% 0.05% - 0.20% / 0.13% (0.30)% - 0.30% / 0.10% |  | 0.25% - 0.25% / 0.25% (0.59)% - 1.00% / 0.27% 0.25% - 0.25% / 0.25% 0.20% - 0.30% / 0.24% (0.30)% - (0.30)% / (0.30)% Priced at Par |
Fair value of fixed maturity securities | 328.4 |  | 165.0 |
Fair Value Measurements, Valuation Techniques | - Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit |  | - Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention |
Corporate Bond Securities - Public | Market Convention [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Measurements, Significant Assumptions |  |  | Priced at Par | [6]
Corporate Bond Securities - Public | Minimum [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | (0.30%) | [2] | (0.59%) | [2]
Fair Value Inputs, Entity Credit Risk | (0.30%) | [3] | (0.30%) | [3]
Fair Value Inputs, Discount for Size | (0.57%) | [5] | 0.25% | [5]
Fair Value Inputs, Change in Benchmark Reference | (0.88%) | [7] | 0.25% | [7]
Fair Value Inputs, Discount for Lack of Marketability | 0.05% | [4] | 0.20% | [4]
Corporate Bond Securities - Public | Maximum [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 1.00% | [2] | 1.00% | [2]
Fair Value Inputs, Entity Credit Risk | 0.30% | [3] | (0.30%) | [3]
Fair Value Inputs, Discount for Size | (0.57%) | [5] | 0.25% | [5]
Fair Value Inputs, Change in Benchmark Reference | (0.88%) | [7] | 0.25% | [7]
Fair Value Inputs, Discount for Lack of Marketability | 0.20% | [4] | 0.30% | [4]
Corporate Bond Securities - Public | Weighted Average [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 0.10% | [2] | 0.27% | [2]
Fair Value Inputs, Entity Credit Risk | 0.10% | [3] | (0.30%) | [3]
Fair Value Inputs, Discount for Size | (0.57%) | [5] | 0.25% | [5]
Fair Value Inputs, Change in Benchmark Reference | (0.88%) | [7] | 0.25% | [7]
Fair Value Inputs, Discount for Lack of Marketability | 0.13% | [4] | 0.24% | [4]
Equity Securities [Member] |  |  |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |
Fair Value Measurements, Significant Assumptions | Priced at Cost or Owner's Equity | [6] | Priced at Cost or Owner's Equity | [6]
Available-for-sale Securities, Equity Securities | $ 4.0 |  | $ 4.0 |
Fair Value Measurements, Valuation Techniques | - Market Convention |  | - Market Convention |
[1] | Represents various actuarial assumptions required to derive the liability cash flows including incidence, termination, and lapse rates
[2] | Represents basis point adjustments for changes in benchmark spreads associated with various industry sectors
[3] | Represents basis point adjustments for credit-specific factors
[4] | Represents basis point adjustments to apply a discount due to the illiquidity of an investment
[5] | Represents basis point adjustments based on issue/issuer size relative to the benchmark
[6] | Represents a decision to price based on par value, cost, or owner's equity when limited data is available
[7] | Represents basis point adjustments for changes in benchmark spreads associated with various ratings categories

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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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. + Details
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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44B -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 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 12-16, 44A, 44B -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44A -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44A, 44B -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. + Details
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- Definition Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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