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Pension Plans - Fair Value of Plans Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | $ 274.2 | $ 280.7 | $ 423.4
Equities and growth funds |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 65.7 | 78.3 |
Government bonds |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 69.6 | 65.7 |
Corporate bonds |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 135.5 | 133.6 |
Cash |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 3.4 | 3.1 |
U.K. |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 274.2 | 252.6 | 376.6
U.K. | Equities and growth funds |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 65.7 | 78.3 |
U.K. | Government bonds |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 69.6 | 65.7 |
U.K. | Corporate bonds |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 135.5 | 106.1 |
U.K. | Cash |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 3.4 | 2.5 |
Foreign Plan |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 0.0 | 28.1 | $ 46.8
Foreign Plan | Equities and growth funds |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 0.0 | 0.0 |
Foreign Plan | Government bonds |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 0.0 | 0.0 |
Foreign Plan | Corporate bonds |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | 0.0 | 27.5 |
Foreign Plan | Cash |  |  |
In respect of defined benefit plans: |  |  |
Total fair value of plan assets | $ 0.0 | $ 0.6 |

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