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Commitments and Contingent Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2013
Commitments And Contingent Liabilities [Abstract] |
Credit Facilities [Table Text Block] |
|  |  |  |  | Amount Utilized(1) |  |
| Facility Capacity |  | Maturity Date |  | March 31, 2013 |  | December 31, 2012 |  | Basis of Fees
| $850.0 |  | December 2015 |  | $ | 140.0 |  | $ | 402.9 |  | Senior unsecured long-term debt rating
| $200.0 |  | September 2019 |  |  | 200.0 |  |  | 200.0 |  | Fixed
| $120.0 |  | May 2016 |  |  | 100.0 |  |  | 100.0 |  | Fixed
| $270.0 |  | November 2017 |  |  | 270.0 |  |  | -- |  | Fixed
(1) | Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.

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