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Senior Notes (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Schedule of Principal Terms of Senior Notes Outstanding | 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 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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