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Senior Notes | 12 Months Ended
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Dec. 31, 2014
Debt Disclosure [Abstract] |
Senior Notes | Senior Notes At December 31, 2014, the Company had three senior notes outstanding. The principal terms of these notes are summarized below.
| 2022 Senior Notes |  | 2024 Senior Notes |  | 2042 Senior Notes
Issue date | October 2012 |  |  | February 2014 |  |  | August 2012 |
Maturity date | October 2022 |  |  | February 2024 |  |  | August 2042 |
Potential Call Date | October 2015 |  |  | Any Time (1) |  |  | August 2017 |
Par value (in millions) | $ | 140.0 |  |  | $ | 400.0 |  |  | $ | 200.0 |
Call Price | At Par |  |  | As Defined (1) |  |  | At Par |
Stated coupon | 5.25 | % |  | 4.25 | % |  | 6.375 | %
Coupon frequency | Quarterly |  |  | Semi-annually |  |  | Quarterly |
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(1) | The 2024 senior notes may be redeemed at any time, in whole or in part, at a make-whole redemption price plus accrued and unpaid interest.
On February 13, 2015, the Company issued $350.0 million aggregate principal amount of 3.50% senior notes due 2025 (the "2025 senior notes"). The unsecured 2025 senior notes pay interest semi-annually and may be redeemed at any time, in whole or in part, at a make-whole redemption price plus accrued and unpaid interest. In addition to customary event of default provisions, the indenture limits the Company's ability to consolidate, merge or sell all or substantially all of its assets.

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- Definition The entire disclosure for long-term debt. + 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 210.5-02.22) -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 22 -Article 5 + Details
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