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Senior Notes (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Principal Terms of Senior Notes Outstanding | At December 31, 2018, the Company had two senior notes outstanding. The carrying value of the senior notes is accreted to the principal amount at maturity over a remaining life of the underlying instrument. The respective principal terms of the senior notes are presented below:
|  | 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 |
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(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. The make-whole redemption price, in each case, is equal to the greater of 100% of the principal amount of the notes to be redeemed and the remaining principal and interest payments on the notes being redeemed (excluding accrued but unpaid interest to, but not including, the redemption date) discounted to their present value as of the redemption date at the applicable treasury rate plus 0.25%.

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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://fasb.org/us-gaap/role/ref/legacyRef -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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