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Senior Notes | 12 Months Ended
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Dec. 31, 2016
Debt Disclosure [Abstract] |
Senior Notes | Senior Notes At December 31, 2016, the Company had three senior notes outstanding, the principal terms of which are summarized below. 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.
|  | 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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