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Debt (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Debt |
Summary of debt | ​
​ | ​ | ​ | ​ | ​ | ​
​ | December 31, | ​ | December 31,
​ | 2024 |  | 2023
​ | (in millions)
Unsecured revolving credit facility maturing September 10, 2029 | $ | — | ​ | $ | —
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 | ​ | 1.1 | ​ | ​ | 1.4
Total | ​ | 1,151.1 | ​ | ​ | 1,151.4
Less: unamortized discount and debt issuance costs | ​ | (8.6) | ​ | ​ | (9.2)
Less: amounts due within one year | ​ | (399.7) | ​ | ​ | (0.3)
Total long-term debt | $ | 742.8 | ​ | $ | 1,141.9
Summary of aggregate maturities of long-term debt for each of the next five years and thereafter | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | (in millions)
2025 | ​ | ​ | ​ | $ | 400.3
2026 | ​ | ​ | ​ | ​ | 0.4
2027 | ​ | ​ | ​ | ​ | 0.4
2028 | ​ | ​ | ​ | ​ | —
2029 | ​ | ​ | ​ | ​ | —
Thereafter | ​ | ​ | ​ | ​ | 750.0
​ | ​ | ​ | ​ | $ | 1,151.1
​

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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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- Definition Tabular disclosure of maturity and sinking fund requirement for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 470 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-1 + Details
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