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v3.25.4

Debt (Tables) | 12 Months Ended
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Dec. 31, 2025
Debt Disclosure [Abstract] |
Schedule of Debt | Debt consists of the following:
|  |  |  |  | December 31
|  |  |  |  | 2025 |  | 2024
| Interest Rates |  | Maturities |  | (in millions of dollars)
Long-term Debt |  |  |  |  |  |  |
Outstanding Principal |  |  |  |  |  |  |
Senior Notes issued 1998 | 6.750 - 7.250% |  | 2028 |  | $ | 335.8 |  |  | $ | 335.8 |
Senior Notes issued 2002 | 7.375% |  | 2032 |  | 39.5 |  |  | 39.5 |
Senior Notes issued 2012 and 2016 | 5.750% |  | 2042 |  | 500.0 |  |  | 500.0 |
Senior Notes issued 2019 | 4.000% |  | 2029 |  | 400.0 |  |  | 400.0 |
Senior Notes issued 2019 | 4.500% |  | 2049 |  | 450.0 |  |  | 450.0 |
Senior Notes issued 2021 | 4.125% |  | 2051 |  | 600.0 |  |  | 600.0 |
Senior Notes issued 2024 | 4.046% |  | 2041 |  | 400.0 |  |  | 400.0 |
Senior Notes issued 2024 | 6.000% |  | 2054 |  | 400.0 |  |  | 400.0 |
Senior Notes issued 2025 | 5.250% |  | 2035 |  | 300.0 |  |  | — |
Medium-term Notes issued 1990 - 1996 | 7.190% |  | 2028 |  | 18.5 |  |  | 18.5 |
Junior Subordinated Debt Securities issued 1998 | 7.405% |  | 2038 |  | 189.7 |  |  | 189.7 |
Junior Subordinated Debt Securities issued 2018 | 6.250% |  | 2058 |  | 300.0 |  |  | 300.0 |
Unamortized Net Discount |  |  |  |  | (129.2) |  |  | (131.3) |
Unamortized Debt Issuance Costs |  |  |  |  | (36.7) |  |  | (37.0) |
Total Long-term Debt |  |  |  |  | $ | 3,767.6 |  |  | $ | 3,465.2 |
Short-term Debt |  |  |  |  |  |  |
Outstanding Principal |  |  |  |  |  |  |
Senior Notes issued 2015 | 3.875% |  | 2025 |  | — |  |  | 275.0 |
Unamortized Net Discount |  |  |  |  | — |  |  | (0.2) |
Unamortized Debt Issuance Costs |  |  |  |  | — |  |  | (0.2) |
Total Short-term Debt |  |  |  |  | — |  |  | 274.6 |
Total Debt |  |  |  |  | $ | 3,767.6 |  |  | $ | 3,739.8 |

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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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