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Pension Plans - Schedule of Net Benefit Costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
In respect of defined benefit plans: |  |  |
Interest cost | $ 11.2 | $ 10.2 | $ 11.2
Expected return on assets | (13.4) | (12.1) | (13.6)
Settlement loss | 0.0 | 0.0 | 8.9
Amortization of net actuarial loss | 1.2 | 1.3 | 1.8
Amortization of prior service credit | (0.4) | (0.4) | (0.4)
Total (credit) / expense for defined benefit plans | (1.4) | (1.0) | 7.9
In respect of defined contribution plans: |  |  |
Total charge for defined contribution plans | 4.0 | 3.8 | 3.7
Total charge for benefit plans | 2.6 | 2.8 | 11.6
U.K. |  |  |
In respect of defined benefit plans: |  |  |
Interest cost | 11.2 | 10.2 | 11.0
Expected return on assets | (13.4) | (12.1) | (13.8)
Settlement loss | 0.0 | 0.0 | 0.0
Amortization of net actuarial loss | 1.2 | 1.3 | 1.7
Amortization of prior service credit | (0.4) | (0.4) | (0.4)
Total (credit) / expense for defined benefit plans | (1.4) | (1.0) | (1.5)
In respect of defined contribution plans: |  |  |
Total charge for defined contribution plans | 2.1 | 2.1 | 2.1
Total charge for benefit plans | 0.7 | 1.1 | 0.6
Other |  |  |
In respect of defined benefit plans: |  |  |
Interest cost | 0.0 | 0.0 | 0.2
Expected return on assets | 0.0 | 0.0 | 0.2
Settlement loss | 0.0 | 0.0 | 8.9
Amortization of net actuarial loss | 0.0 | 0.0 | 0.1
Amortization of prior service credit | 0.0 | 0.0 | 0.0
Total (credit) / expense for defined benefit plans | 0.0 | 0.0 | 9.4
In respect of defined contribution plans: |  |  |
Total charge for defined contribution plans | 1.9 | 1.7 | 1.6
Total charge for benefit plans | $ 1.9 | $ 1.7 | $ 11.0

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