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Senior Notes | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Senior Notes | Senior Notes In 2017, the Company redeemed, canceled and retired all $200.0 million principal amount outstanding of its 6.375% senior unsecured notes due 2042 at a redemption price equal to 100% of the principal amount. At December 31, 2017, the Company had two senior notes outstanding and their respective principal terms are summarized in the following table:
|  | 2024 Senior Notes |  | 2025 Senior Notes
Issue date |  | February 2014 |  |  | February 2015 |
Maturity date |  | February 2024 |  |  | August 2025 |
Potential Call Date(1) |  | Any Time |  |  | Any Time |
Par value (in millions) |  | $ | 400.0 |  |  | $ | 350.0 |
Call Price(1) |  | As Defined |  |  | As Defined |
Stated coupon |  | 4.25 | % |  | 3.50 | %
Coupon frequency |  | Semi-annually |  |  | Semi-annually |
__________________________
(1) | The 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 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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