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Commitments and Contingent Liabilities (Narrative) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 credit_facilities | Dec. 31, 2013
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Commitments And Contingent Liabilities [Line Items] |  |
Undrawn outstanding letters of credit in favor of third parties | $ 195.4 | $ 210.3
Undrawn outstanding letters of credit between subsidiaries | 1,216.3 | 995.5
Number of credit facilities | 9 |
Guarantee Of Subsidiary Collateral Financing [Member] |  |
Commitments And Contingent Liabilities [Line Items] |  |
Guarantor Obligations, Current Carrying Value | 300.0 |
Credit Facility 850 Million [Member] |  |
Commitments And Contingent Liabilities [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 850.0 |
Letter of Credit [Member] |  |
Commitments And Contingent Liabilities [Line Items] |  |
Number of credit facilities | 8 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,060.2 |

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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 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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