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Debt (Tables) | 12 Months Ended
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Dec. 31, 2019
Debt Disclosure [Abstract] |
Schedule of Company's Debt | The following table summarizes the Company’s Debt:
| December 31,
| 2018 |  | 2019
Senior bank debt | $ | 779.7 |  |  | $ | 449.7 |
Senior notes | 742.5 |  |  | 743.8 |
Junior convertible securities | 307.4 |  |  | 310.6 |
Junior subordinated notes | — |  |  | 289.7 |
Debt | $ | 1,829.6 |  |  | $ | 1,793.8 |
Schedule of Principal Terms of Senior and Junior Subordinated Notes | The principal terms of the senior notes and junior subordinated notes were as follows:
|  | 2024 Senior Notes |  | 2025 Senior Notes |  | 2059 Junior Subordinated Notes
Issue date |  | February 2014 |  |  | February 2015 |  |  | March 2019 |
Maturity date |  | February 2024 |  |  | August 2025 |  |  | March 2059 |
Par value (in millions) |  | $ | 400.0 |  |  | $ | 350.0 |  |  | $ | 300.0 |
Stated coupon |  | 4.25 | % |  | 3.50 | % |  | 5.875 | %
Coupon frequency |  | Semi-annually |  |  | Semi-annually |  |  | Quarterly(3) |
Potential call date |  | Any time(1) |  |  | Any time(1) |  |  | March 2024(2) |
Call price |  | As defined(1) |  |  | As defined(1) |  |  | As defined(2) |
Listing |  | N.A. |  |  | N.A. |  |  | NYSE |
__________________________
(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%.
(2) | The junior subordinated notes may be redeemed at any time, in whole or in part, on or after March 30, 2024, at 100% of the principal amount of the notes being redeemed plus any accrued and unpaid interest thereon. Prior to March 30, 2024, the junior subordinated notes may also be redeemed, in whole but not in part, at 100% of the principal amount, plus any accrued and unpaid interest, if certain changes in tax laws, regulations or interpretations occur; or at 102% of the principal amount, plus any accrued and unpaid interest, if a rating agency makes certain changes relating to the equity credit criteria for securities with features similar to the junior subordinated notes.
(3) The Company may, at its option, and subject to certain conditions and restrictions, defer interest payments subject to the terms of the junior subordinated notes.
Schedule of Carrying Value of and Principal Amount at Maturity of Convertible Securities | The carrying value and principal amount at maturity of the junior convertible securities were as follows:
|  | December 31, 2018 |  | December 31, 2019
|  | Carrying Value |  | Principal Amount at Maturity |  | Carrying Value |  | Principal Amount at Maturity
Junior convertible securities(1) |  | $ | 312.5 |  |  | $ | 430.8 |  |  | $ | 315.4 |  |  | $ | 430.8 |
__________________________ (1) The carrying value is accreted to the principal amount at maturity over a remaining life of 18 years.

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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