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Commitments and Contingent Liabilities (Details 1) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 credit_facilities | Dec. 31, 2012
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Commitments And Contingent Liabilities [Line Items] |  |
Undrawn outstanding letters of credit in favor of third parties | $ 76.2 | $ 45.4
Undrawn outstanding letters of credit between subsidiaries | 861.3 | 763.5
Number of credit facilities | 5 |
Syndicated revolving credit facility capacity | 850.0 |
Insurance Treaty Guarantee [Member] |  |
Commitments And Contingent Liabilities [Line Items] |  |
Guarantor Obligations, Current Carrying Value | 815.2 | 686.0
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member] |  |
Commitments And Contingent Liabilities [Line Items] |  |
Guarantor Obligations, Current Carrying Value | 628.1 | 463.5
Guarantee Of Borrowed Securities [Member] |  |
Commitments And Contingent Liabilities [Line Items] |  |
Guarantor Obligations, Current Carrying Value | 87.5 |
Guarantee Of Subsidiary Collateral Financing [Member] |  |
Commitments And Contingent Liabilities [Line Items] |  |
Guarantor Obligations, Current Carrying Value | 300.0 |
Letter of Credit [Member] |  |
Commitments And Contingent Liabilities [Line Items] |  |
Number of credit facilities | 4 |
Facility Capacity | 690.0 |
Commitment Period 2033 [Member] | Statutory Reserve Support Guarantee [Member] |  |
Commitments And Contingent Liabilities [Line Items] |  |
Maximum potential obligation, Undiscounted | 350.0 |
Commitment Period 2035 [Member] | Statutory Reserve Support Guarantee [Member] |  |
Commitments And Contingent Liabilities [Line Items] |  |
Maximum potential obligation, Undiscounted | 560.0 |
Limited Partnerships [Member] |  |
Commitments And Contingent Liabilities [Line Items] |  |
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments | 241.8 | 176.7
Commercial Mortgage Loans [Member] |  |
Commitments And Contingent Liabilities [Line Items] |  |
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments | 42.5 | 22.2
Bank Loans [Member] |  |
Commitments And Contingent Liabilities [Line Items] |  |
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments | $ 74.5 | $ 68.5

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- Details
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- Definition Loan commitments are legally binding commitments to extend credit to a counterparty under certain terms and conditions. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Number of credit facilities + References No definition available. + Details
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- Definition Overall capacity of the Company's syndicated revolving credit facility. + References No definition available. + Details
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Balance Type: | credit
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- Definition Undrawn outstanding letters of credit between subsidiaries of the Company. + References No definition available. + Details
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- Definition Undrawn outstanding letters of credit in favor of third parties. + References No definition available. + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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