Outstanding aggregate principal amount

  
exposure on the portion of the 2021 Senior Notes that were redeemed in September 2019. The $2.6 million loss was reclassified out of accumulated other comprehensive income and recorded through interest expense. In connection with the issuance of the 2030 Senior Notes, the Company recognized $3.0 million of interest expense related to premiums paid for a series of derivative transactions that were entered into in July 2019 to hedge the related interest rate risk. In March 2018, the Company issued the following three series of senior notes with an aggregate principal amount of $900.0 million:•2021 Senior Notes: The first series of senior notes was $300.0 million in principal amount, bore a floating interest rate equal to three-month LIBOR plus 1.25% and was to mature in March 2021. Interest on the 2021 Senior Notes was payable quarterly. Commencing on or after March 2019, the Company could redeem the 2021 Senior Notes at any time in whole or from time to time in part at a redemption price equal to 100% of the principal amount being redeemed plus accrued and unpaid interest. In August 2019, the Company redeemed $250.0 million of the $300.0 million then outstanding aggregate principal amount of the 2021 Senior Notes, plus accrued and unpaid interest to the redemption date. In January 2021, the Company redeemed the remaining $50.0 million outstanding aggregate principal amount of the 2021 Senior Notes, plus accrued and unpaid interest to the redemption date, in advance of the original maturity in March 2021.•2023 Senior Notes: The second series of senior notes is $300.0 million in principal amount, bears interest at 4.20% per year, matures in September 2023 and was issued at a 0.233% discount to the public (the “2023 Senior Notes”). Interest on the 2023 Senior Notes is payable semi-annually. Prior to August 2023, the Company may redeem the 2023 Senior Notes at any time in whole or from time to time in part at a make-whole premium plus accrued and unpaid interest. On or after that date, the Company may redeem the 2023 Senior Notes at any time in whole or from time to time in part at a redemption price equal to 100% of the principal amount being redeemed plus accrued and unpaid interest.•2028 Senior Notes: The third series of senior notes is $300.0 million in principal amount, bears interest at 4.90% per year, matures in March 2028 and was issued at a 0.383% discount to the public (the “2028 Senior Notes”). Interest on the 2028 Senior Notes is payable semi-annually. Prior to December 2027, the Company may redeem the 2028 Senior Notes at any time in whole or from time to time in part at a make-whole premium plus accrued and unpaid interest. On or after that date, the Company may redeem the 2028 Senior Notes at any time in whole or from time to time in part at a redemption price equal to 100% of the principal amount being redeemed plus accrued and unpaid interest.The interest rate payable on each of the 2023 Senior Notes, 2028 Senior Notes, 2030 Senior Notes and 2032 Senior Notes will be subject to adjustment from time to time, if either Moody’s Investor Service, Inc. (“Moody’s”) or S&P Global Ratings, a division of S&P Global Inc. (“S&P”) downgrades the credit rating assigned to such series of senior notes to Ba1 or below or to BB+ or below, respectively, or subsequently upgrades the credit ratings once the senior notes are at or below such levels. The following table details the increase in interest rate over the issuance rate by rating with the impact equal to the sum of the number of basis points next to such rating for a maximum increase of 200 basis points over the issuance rate:

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|  |  | Rating Agencies |  |  |
| Rating Levels |  | Moody’s (1) |  | S&P (1) |  | Interest Rate Increase (2) |
| 1 |  | Ba1 |  | BB+ |  | 25 basis points |
| 2 |  | Ba2 |  | BB  |  | 50 basis points |
| 3 |  | Ba3 |  | BB- |  | 75 basis points |
| 4 |  | B1 or below |  | B+ or below |  | 100 basis points |

(1)Including the equivalent ratings of any substitute rating agency. (2)Applies to each rating agency individually. In March 2013, the Company issued two series of senior notes, one of which was repaid at maturity in March 2018. The second series was $350.0 million in aggregate principal amount, was issued at a 0.365% discount to the public, bore interest at 4.00% per year and was to mature in March 2023 (the “2023 Senior Notes”). In July 2021, we used the proceeds from the issuance of the 2032 Senior Notes, along with cash on hand, to redeem all of the $350.0 million outstanding aggregate principal amount of the 2023 Senior Notes. A loss on extinguishment of debt of $20.7 million was reported for the year ended December 31, 2021.In February 2004, the Company issued senior notes with an aggregate principal amount of $475.0 million at a 0.61% discount to the public, which bear interest at 6.75% per year and matures in February 2034. Interest is payable semi-annually. F-60
