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Debt (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2024
Debt |
Summary of debt | ​
​ | ​ | ​ | ​ | ​ | ​
​ | June 30, | ​ | December 31,
​ | 2024 |  | 2023
​ | (in millions)
Unsecured revolving credit facility maturing September 3, 2025 | $ | — | ​ | $ | —
Senior unsecured notes, interest payable semi-annually at 1.30%, effective rate of 1.53%, maturing August 15, 2025 | ​ | 400.0 | ​ | ​ | 400.0
Senior unsecured notes, interest payable semi-annually at 2.15%, effective rate of 2.27%, maturing August 15, 2030 | ​ | 500.0 | ​ | ​ | 500.0
Senior unsecured notes, interest payable semi-annually at 6.85%, effective rate of 6.91%, maturing November 15, 2036 | ​ | 250.0 | ​ | ​ | 250.0
Other notes | ​ | 1.4 | ​ | ​ | 1.4
Total | ​ | 1,151.4 | ​ | ​ | 1,151.4
Less: unamortized discount and debt issuance costs | ​ | (7.8) | ​ | ​ | (9.2)
Less: amounts due within one year | ​ | (0.3) | ​ | ​ | (0.3)
Total long-term debt | $ | 1,143.3 | ​ | $ | 1,141.9

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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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