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Debt and Credit Arrangements (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 |
(in millions) |  |  |  |  |  |
Short-term: |  |  |  |  |  |
Senior debentures maturing April 15, 2026 |  | $ | 375.0 |  |  | $ | — |
Senior debentures maturing October 15, 2025 |  |  | — |  |  |  | 61.8 |
Total short-term debt |  |  | 375.0 |  |  |  | 61.8 |
Long-term: |  |  |  |  |  |
Senior debentures maturing September 1, 2035 |  |  | 500.0 |  |  |  | — |
Senior debentures maturing April 15, 2026 |  |  | — |  |  |  | 375.0 |
Senior debentures maturing September 1, 2030 |  |  | 300.0 |  |  |  | 300.0 |
Subordinated debentures maturing February 3, 2027 |  |  | 50.1 |  |  |  | 50.1 |
Long-term debt principal |  |  | 850.1 |  |  |  | 725.1 |
Unamortized debt issuance costs |  |  | (6.8 | ) |  |  | (2.8 | )
Total long-term debt |  |  | 843.3 |  |  |  | 722.3 |
Total debt |  | $ | 1,218.3 |  |  | $ | 784.1 |

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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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