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Senior Notes (Tables) | 12 Months Ended
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Dec. 31, 2012
Senior Notes |
Summary of principal terms of senior notes |
|  | 2022 Senior Notes |  | 2042 Senior Notes |
--- | --- | --- | --- | --- | ---
Issue date |  |  | October 2012 |  |  | August 2012 |
Maturity date |  |  | October 2022 |  |  | August 2042 |
Potential Call Date |  |  | October 2015 |  |  | August 2017 |
Par value (in millions) |  | $ | 140.0 |  | $ | 200.0 |
Call Price |  |  | At Par |  |  | At Par |
Stated coupon |  |  | 5.25 | % |  | 6.375 | %
Coupon frequency |  |  | Quarterly |  |  | Quarterly |

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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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