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Debt (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of Company's Debt | The following table summarizes the Company’s Debt:
| December 31,
| 2019 |  | 2020
Senior bank debt | $ | 449.7 |  |  | $ | 349.8 |
Senior notes | 743.8 |  |  | 1,091.9 |
Junior convertible securities | 310.6 |  |  | 314.0 |
Junior subordinated notes | 289.7 |  |  | 556.4 |
Debt | $ | 1,793.8 |  |  | $ | 2,312.1 |
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 |  | 2030 Senior Notes |  | 2059 Junior Subordinated Notes |  | 2060 Junior Subordinated Notes
Issue date |  | February 2014 |  | February 2015 |  | June 2020 |  | March 2019 |  | September 2020
Maturity date |  | February 2024 |  | August 2025 |  | June 2030 |  | March 2059 |  | September 2060
Par value (in millions) |  | $ | 400.0 |  |  | $ | 350.0 |  |  | $ | 350.0 |  |  | $ | 300.0 |  |  | $ | 275.0 |
Stated coupon |  | 4.25 | % |  | 3.50 | % |  | 3.30 | % |  | 5.875 | % |  | 4.750 | %
Coupon frequency |  | Semi-annually |  | Semi-annually |  | Semi-annually |  | Quarterly(3) |  | Quarterly(3)
Potential call date |  | Any time(1) |  | Any time(1) |  | Any time(1) |  | March 2024(2) |  | September 2025(2)
Call price |  | As defined(1) |  | As defined(1) |  | As defined(1) |  | As defined(2) |  | As defined(2)
Listing |  | N.A. |  | N.A. |  | N.A. |  | NYSE |  | NYSE
__________________________ (1)The 2024, 2025 and 2030 senior notes may be redeemed, in whole or in part, at any time, in the case of the 2024 and 2025 senior notes, and at any time prior to March 15, 2030, in the case of the 2030 senior notes. In each case, the senior notes may be redeemed 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%, in the case of the 2024 and the 2025 senior notes, and to their present value as of the redemption date on a semi-annual basis at the applicable treasury rate plus 0.40%, in the case of the 2030 senior notes. (2)The 2059 and 2060 junior subordinated notes may be redeemed at any time, in whole or in part, on or after March 30, 2024, in the case of the 2059 junior subordinated notes, and on or after September 30, 2025, in the case of the 2060 junior subordinated notes. In each case, the junior subordinated notes may be redeemed at 100% of the principal amount of the notes being redeemed plus any accrued and unpaid interest thereon. Prior to the applicable redemption date, at the Company’s option, the applicable 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 applicable 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, 2019 |  | December 31, 2020
|  | Carrying Value |  | Principal Amount at Maturity |  | Carrying Value |  | Principal Amount at Maturity
Junior convertible securities(1) |  | $ | 315.4 |  |  | $ | 430.8 |  |  | $ | 318.4 |  |  | $ | 430.8 |
__________________________(1)The carrying value is accreted to the principal amount at maturity over a remaining life of 17 years.

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