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Commitments Contingencies and Guarantees (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Other Commitments [Line Items] |  |  |
Undrawn Outstanding Letters Of Credit In Favor Of Third Parties | $ 132,200,000 | $ 176,500,000 |
Undrawn Outstanding Letters Of Credit Between Subsidiaries | 1,127,400,000 | 1,035,000,000 |
Line of Credit Facility, Maximum Borrowing Capacity | 701,100,000.0 |  |
Line of Credit Facility, Commitment Fee Amount | 10,900,000 | 12,600,000 | $ 9,800,000
Operating Leases, Rent Expense | 12,100,000 | 19,300,000 | $ 18,500,000
Maximum Capital Lease Obligations As Offset Against Industrial Bonds | 150,000,000 |  |
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member] |  |  |
Other Commitments [Line Items] |  |  |
Guarantor Obligations, Current Carrying Value | 634,909,000,000 | 664,913,000,000 |
Guarantee Of Borrowed Securities [Member] |  |  |
Other Commitments [Line Items] |  |  |
Guarantor Obligations, Current Carrying Value | 259,540,000,000 | $ 201,050,000,000 |
Syndicated Credit Facility $850 Million [Member] |  |  |
Other Commitments [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 850,000,000 |  |

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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 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 + Details
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