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Pension Plans - Fair Value of Plans Assets (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | $ 268.2 | $ 254.3 | $ 274.2
Equities and growth funds |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 0.0 | 70.1 |
Government bonds |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 209.2 | 76.6 |
Corporate bonds |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 0.0 | 105.3 |
Cash |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | $ 59.0 | $ 2.3 |

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