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Commitments and Contingent Liabilities (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Commitments And Contingent Liabilities [Line Items] |  |  |
Undrawn Outstanding Letters Of Credit In Favor Of Third Parties | $ 210,300,000 | $ 45,400,000 |
Undrawn Outstanding Letters Of Credit Between Subsidiaries | 995,500,000 | 763,500,000 |
Line of Credit Facility, Maximum Borrowing Capacity | 880,900,000.0 |  |
Line of Credit Facility, Commitment Fee Amount | 9,800,000 | 7,300,000 | 4,900,000
Operating Leases, Rent Expense | 18,500,000 | 19,500,000 | 18,800,000
Syndicated Credit Facility $850 Million [Member] |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 850,000,000.0 |  |
Insurance Treaty Guarantee [Member] |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |
Guarantor Obligations, Current Carrying Value | 826,900,000 | 686,000,000 |
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member] |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |
Guarantor Obligations, Current Carrying Value | 647,900,000 | 463,500,000 |
Guarantee Of Borrowed Securities [Member] |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |
Guarantor Obligations, Current Carrying Value | 93,000,000 | 87,500,000 |
Guarantee Of Lease Obligations [Member] |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |
Operating Leases, Rent Expense | 8,300,000 | 10,100,000 |
Guarantee Of Subsidiary Collateral Financing [Member] |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |
Guarantor Obligations, Current Carrying Value | 300,000,000 |  |
Limited Partner [Member] |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |
Commitments To Extend Credit | 239,500,000 | 176,700,000 |
Commercial Loan [Member] |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |
Commitments To Extend Credit | 4,600,000 | 22,200,000 |
Private Placement Investments [Member] |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |
Commitments To Extend Credit | 22,000,000 |  |
Bank Loans [Member] |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |
Commitments To Extend Credit | $ 37,000,000 | $ 68,500,000 |

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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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- 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 Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Amount of the fee for available but unused credit capacity under the credit 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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- 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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