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v3.23.3

Debt (Tables) | 9 Months Ended
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Sep. 30, 2023
Debt Disclosure [Abstract] |
Summary of Debt | At September 30, 2023 and December 31, 2022, our long-term debt and interest rates on that debt were as follows (dollars in millions):
|  | September 30, |  |  | December 31, |  |
|  | 2023 |  |  | 2022 |  |
Revolving Credit Facility |  | $ | — |  |  | $ | — |  |
3.65% Senior Notes, net of discount of $0.1 million and $0.2 million as of September 30, 2023 and December 31, 2022, respectively, due September 2024 |  |  | 399.9 |  |  |  | 399.8 |  |
3.40% Senior Notes, net of discount of $0.8 million and $0.9 million as of September 30, 2023 and December 31, 2022, respectively, due December 2027 |  |  | 499.2 |  |  |  | 499.1 |  |
3.00% Senior Notes, net of discount of $0.4 million and $0.5 million as of September 30, 2023 and December 31, 2022, respectively, due December 2029 |  |  | 499.6 |  |  |  | 499.5 |  |
4.05% Senior Notes, net of discount of $3.3 million as of both September 30, 2023 and December 31, 2022, due December 2049 |  |  | 396.7 |  |  |  | 396.7 |  |
3.05% Senior Notes, net of discount of $3.5 million and $3.6 million as of September 30, 2023 and December 31, 2022, respectively, due October 2051 |  |  | 696.5 |  |  |  | 696.4 |  |
Total |  |  | 2,491.9 |  |  |  | 2,491.5 |  |
Less current portion (a) |  |  | 399.5 |  |  |  | — |  |
Less unamortized debt issuance costs |  |  | 16.7 |  |  |  | 17.9 |  |
Total long-term debt |  | $ | 2,075.7 |  |  | $ | 2,473.6 |  |
(a) The current portion of long-term debt excludes unamortized debt issuance costs of $0.4 million at September 30, 2023.

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