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v3.25.2

Long-Term Debt (Tables) | 6 Months Ended
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Jun. 30, 2025
Debt Disclosure [Abstract] |
Outstanding Long-Term Debt | Our outstanding long-term debt is shown below:
|  | June 30, |  | December 31,
(in millions) |  | 2025 |  | 2024
Uncollateralized Senior Notes: |  |  |  |
5.68% notes, due June 2026 |  | $ | 2.9 |  |  | $ | 5.8 |
6.39% notes, due December 2026 |  | 100.0 |  |  | 100.0 |
6.44% notes, due December 2027 |  | 100.0 |  |  | 100.0 |
6.43% notes, due May 2028 |  | 2.1 |  |  | 2.8 |
3.73% notes, due December 2028 |  | 8.0 |  |  | 8.0 |
6.45% notes, due December 2028 |  | 100.0 |  |  | 100.0 |
3.88% notes, due May 2029 |  | 20.0 |  |  | 25.0 |
5.20% notes, due November 2029 |  | 100.0 |  |  | 100.0 |
6.62% notes, due December 2030 |  | 100.0 |  |  | 100.0 |
3.25% notes, due April 2032 |  | 49.0 |  |  | 52.5 |
6.71% notes, due December 2033 |  | 100.0 |  |  | 100.0 |
2.98% notes, due December 2034 |  | 70.0 |  |  | 70.0 |
3.00% notes, due July 2035 |  | 50.0 |  |  | 50.0 |
2.96% notes, due August 2035 |  | 40.0 |  |  | 40.0 |
2.49% notes, due January 2037 |  | 50.0 |  |  | 50.0 |
5.43% notes, due March 2038 |  | 80.0 |  |  | 80.0 |
3.48% notes, due May 2038 |  | 50.0 |  |  | 50.0 |
3.58% notes, due November 2038 |  | 50.0 |  |  | 50.0 |
6.73% notes, due December 2038 |  | 50.0 |  |  | 50.0 |
3.98% notes, due August 2039 |  | 100.0 |  |  | 100.0 |
2.95% notes, due March 2042 |  | 50.0 |  |  | 50.0 |
Equipment security note |  |  |  |
2.46% note, due September 2031 |  | 6.3 |  |  | 6.7 |
Less: debt issuance costs |  | (3.2) |  |  | (3.6) |
Total long-term debt |  | 1,275.1 |  |  | 1,287.2 |
Less: current maturities |  | (25.5) |  |  | (25.5) |
Total long-term debt, net of current maturities |  | $ | 1,249.6 |  |  | $ | 1,261.7 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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