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Debt (Tables) | 9 Months Ended
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Sep. 30, 2024
Debt Disclosure [Abstract] |
Summary of Debt | At September 30, 2024 and December 31, 2023, our long-term debt and interest rates on that debt were as follows (dollars in millions):
|  | September 30, |  |  | December 31, |  |
|  | 2024 |  |  | 2023 |  |
Revolving Credit Facility |  | $ | — |  |  | $ | — |  |
3.65% Senior Notes, net of discount of $0.1 million as of December 31, 2023, due September 2024 |  |  | — |  |  |  | 399.9 |  |
3.40% Senior Notes, net of discount of $0.6 million and $0.7 million as of September 30, 2024 and December 31, 2023, respectively, due December 2027 |  |  | 499.4 |  |  |  | 499.3 |  |
3.00% Senior Notes, net of discount of $0.4 million as of both September 30, 2024 and December 31, 2023, due December 2029 |  |  | 499.6 |  |  |  | 499.6 |  |
5.70% Senior Notes, net of discount of $0.3 million as of both September 30, 2024 and December 31, 2023, due December 2033 |  |  | 399.7 |  |  |  | 399.7 |  |
4.05% Senior Notes, net of discount of $3.2 million and $3.3 million as of September 30, 2024 and December 31, 2023, respectively, due December 2049 |  |  | 396.8 |  |  |  | 396.7 |  |
3.05% Senior Notes, net of discount of $3.4 million and $3.5 million as of September 30, 2024 and December 31, 2023, respectively, due October 2051 |  |  | 696.6 |  |  |  | 696.5 |  |
Total |  |  | 2,492.1 |  |  |  | 2,891.7 |  |
Less current portion (a) |  |  | — |  |  |  | 399.6 |  |
Less unamortized debt issuance costs |  |  | 18.4 |  |  |  | 19.9 |  |
Total long-term debt |  | $ | 2,473.7 |  |  | $ | 2,472.2 |  |
(a) As of September 30, 2024, there are no unamortized debt issuance costs associated with the current portion of long-term debt, as the 2024 senior notes due September 2024 were repaid on September 15, 2024. As of December 31, 2023, the current portion of long-term debt excludes unamortized debt issuance costs of $0.3 million.

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