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Senior Notes | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Senior Notes | Senior Notes In 2015, the Company redeemed, canceled and retired all $140.0 million principal amount outstanding of its 5.25% senior unsecured notes due 2022 at a redemption price equal to 100% of the principal amount plus accrued and unpaid interest. In February 2015, the Company issued additional senior notes, and at December 31, 2015 had three senior notes outstanding, the principal terms of which are summarized below.
|  | 2024 Senior Notes |  | 2025 Senior Notes |  | 2042 Senior Notes
Issue date |  | February 2014 |  |  | February 2015 |  |  | August 2012 |
Maturity date |  | February 2024 |  |  | August 2025 |  |  | August 2042 |
Potential Call Date |  | Any Time (1) |  |  | Any Time (1) |  |  | August 2017 |
Par value (in millions) |  | $ | 400.0 |  |  | $ | 350.0 |  |  | $ | 200.0 |
Call Price |  | As Defined (1) |  |  | As Defined (1) |  |  | At Par |
Stated coupon |  | 4.25 | % |  | 3.50 | % |  | 6.375 | %
Coupon frequency |  | Semi-annually |  |  | Semi-annually |  |  | Quarterly |
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(1) | The 2024 and 2025 senior notes may be redeemed at any time, in whole or in part, at a make-whole redemption price plus accrued and unpaid interest.

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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 + Details
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