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Commitments and Contingent Liabilities (Narrative) (Details) $ in Millions | Jun. 30, 2015 USD ($) credit_facilities | Dec. 31, 2014 USD ($)
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Commitments And Contingent Liabilities [Line Items] |  |
Undrawn outstanding letters of credit in favor of third parties | $ 147.2 | $ 176.5
Undrawn outstanding letters of credit between subsidiaries | $ 1,159.5 | $ 1,035.0
Number of credit facilities | credit_facilities | 8 |
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 | credit_facilities | 7 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 806.7 |

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