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Pension Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Retirement Benefits [Abstract] |
Reconciliations of Plan Benefit Obligation, Fair Value of Plan Assets and Funded Status of Pension Plans | The following tables present reconciliations of pension benefit obligations, fair value of plan assets and the funded status of pension plans as of and for the years ended December 31, 2023 and 2022:
|  | 2023 |  | 2023 |  | 2023 |  | 2022 |  | 2022 |  | 2022 |
| In millions | U.K. |  | U.S. / other |  | Total |  | U.K. |  | U.S. / other |  | Total |
| Change in benefit obligations |  |  |  |  |  |  |  |  |  |  |  |
| Benefit obligation at January 1 | $ | 225.6 |  |  | $ | 32.6 |  |  | $ | 258.2 |  |  | $ | 362.9 |  |  | $ | 48.7 |  |  | $ | 411.6 |  |
| Interest cost | 11.0 |  |  | 0.2 |  |  | 11.2 |  |  | 6.2 |  |  | 1.3 |  |  | 7.5 |  |
| Settlement gain | — |  |  | (29.3) |  |  | (29.3) |  |  | — |  |  | (5.9) |  |  | (5.9) |  |
| Actuarial gains | (2.9) |  |  | (2.5) |  |  | (5.4) |  |  | (93.7) |  |  | (9.0) |  |  | (102.7) |  |
| Exchange difference | 12.8 |  |  | — |  |  | 12.8 |  |  | (37.0) |  |  | — |  |  | (37.0) |  |
| Benefits paid | (12.6) |  |  | (0.9) |  |  | (13.5) |  |  | (12.8) |  |  | (2.5) |  |  | (15.3) |  |
| Benefit obligation at December 31 | $ | 233.9 |  |  | $ | 0.1 |  |  | $ | 234.0 |  |  | $ | 225.6 |  |  | $ | 32.6 |  |  | $ | 258.2 |  |
| Change in plan assets |  |  |  |  |  |  |  |  |  |  |  |
| Fair value of plan assets at January 1 | $ | 252.6 |  |  | $ | 28.1 |  |  | $ | 280.7 |  |  | $ | 376.6 |  |  | $ | 46.8 |  |  | $ | 423.4 |  |
| Actual return on assets | 19.4 |  |  | — |  |  | 19.4 |  |  | (71.2) |  |  | (10.4) |  |  | (81.6) |  |
| Exchange difference | 14.6 |  |  | — |  |  | 14.6 |  |  | (40.4) |  |  | — |  |  | (40.4) |  |
| Contributions from employer | 0.2 |  |  | 2.1 |  |  | 2.3 |  |  | 0.4 |  |  | — |  |  | 0.4 |  |
| Benefits paid | (12.6) |  |  | (0.9) |  |  | (13.5) |  |  | (12.8) |  |  | (2.4) |  |  | (15.2) |  |
| Settlement loss | — |  |  | (29.3) |  |  | (29.3) |  |  | — |  |  | (5.9) |  |  | (5.9) |  |
| Fair value of plan assets at December 31 | $ | 274.2 |  |  | $ | — |  |  | $ | 274.2 |  |  | $ | 252.6 |  |  | $ | 28.1 |  |  | $ | 280.7 |  |
| Funded status |  |  |  |  |  |  |  |  |  |  |  |
| Net benefit surplus / (obligation) | $ | 40.3 |  |  | $ | (0.1) |  |  | $ | 40.2 |  |  | $ | 27.0 |  |  | $ | (4.5) |  |  | $ | 22.5 |  |
Schedule of Net Benefit Costs | The amounts recognized in the Consolidated Statements of Income in respect of the pension plans were as follows:
|  | 2023 |  | 2023 |  | 2023 |  | 2022 |  | 2022 |  | 2022 |  | 2021 |  | 2021 |  | 2021 |
| In millions | U.K. |  | U.S. / other |  | Total |  | U.K. |  | U.S. / other |  | Total |  | U.K. |  | U.S. / other |  | Total |
| In respect of defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest cost | 11.0 |  |  | 0.2 |  |  | 11.2 |  |  | 6.2 |  |  | 1.3 |  |  | 7.5 |  |  | 5.6 |  |  | 1.1 |  |  | 6.7 |  |
| Expected return on assets | (13.8) |  |  | 0.2 |  |  | (13.6) |  |  | (10.4) |  |  | (0.7) |  |  | (11.1) |  |  | (10.2) |  |  | (1.8) |  |  | (12.0) |  |
| Settlement loss | — |  |  | 8.9 |  |  | 8.9 |  |  | — |  |  | 2.0 |  |  | 2.0 |  |  | — |  |  | — |  |  | — |  |
| Amortization of net actuarial loss | 1.7 |  |  | 0.1 |  |  | 1.8 |  |  | 1.8 |  |  | 0.3 |  |  | 2.1 |  |  | 3.4 |  |  | 0.4 |  |  | 3.8 |  |
| Amortization of prior service credit | (0.4) |  |  | — |  |  | (0.4) |  |  | (0.4) |  |  | — |  |  | (0.4) |  |  | (0.4) |  |  | — |  |  | (0.4) |  |
| Total (credit) / expense for defined benefit plans | $ | (1.5) |  |  | $ | 9.4 |  |  | $ | 7.9 |  |  | $ | (2.8) |  |  | $ | 2.9 |  |  | $ | 0.1 |  |  | $ | (1.6) |  |  | $ | (0.3) |  |  | $ | (1.9) |  |
| In respect of defined contribution plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Total charge for defined contribution plans | $ | 2.1 |  |  | $ | 1.6 |  |  | $ | 3.7 |  |  | $ | 2.0 |  |  | $ | 1.7 |  |  | $ | 3.7 |  |  | $ | 2.1 |  |  | $ | 1.5 |  |  | $ | 3.6 |  |
| Total charge / (credit) for benefit plans | $ | 0.6 |  |  | $ | 11.0 |  |  | $ | 11.6 |  |  | $ | (0.8) |  |  | $ | 4.6 |  |  | $ | 3.8 |  |  | $ | 0.5 |  |  | $ | 1.2 |  |  | $ | 1.7 |  |
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income | The following table shows other changes in plan assets and benefit obligations recognized in other comprehensive income during the years ended December 31:
| In millions | 2023 |  | 2022 |  | 2021 |
| Net actuarial gain | $ | 11.4 |  |  | $ | 8.2 |  |  | $ | 38.8 |  |
| Amortization of actuarial loss | 1.8 |  |  | 2.1 |  |  | 3.8 |  |
| Actuarial loss recognized due to settlement event | 8.9 |  |  | 2.0 |  |  | — |  |
| Amortization of prior service credit | (0.4) |  |  | (0.4) |  |  | (0.4) |  |
| Total recognized in other comprehensive income | 21.7 |  |  | 11.9 |  |  | 42.2 |  |
| Total recognized in net periodic benefit cost and other comprehensive income | $ | 13.8 |  |  | $ | 11.8 |  |  | $ | 44.1 |  |
The following table shows the amounts included in AOCI that have not yet been recognized as components of net periodic benefit cost for the years ended December 31:
| In millions | 2023 |  | 2022 |
| Gross actuarial loss | $ | (88.1) |  |  | $ | (110.2) |  |
| Gross prior service credit | 10.6 |  |  | 11.0 |  |
| Total included in AOCI not yet recognized in the statement of income | $ | (77.5) |  |  | $ | (99.2) |  |
Schedule of Assumptions Used | The financial assumptions used in the calculations were:
|  | Projected Unit Credit Valuation |
|  | U.K. |  | U.S. |
|  | 2023 |  | 2022 |  | 2021 |  | 2023 |  | 2022 |  | 2021 |
|  | % |  | % |  | % |  | % |  | % |  | % |
| Discount rate | 4.50 |  |  | 4.80 |  |  | 1.90 |  |  | n/a |  | 5.10 |  |  | 2.70 |  |
| Expected return on assets | 4.80 |  |  | 5.60 |  |  | 3.30 |  |  | n/a |  | 4.70 |  |  | 2.50 |  |
| Pre-2030 |  |  |  |  |  |  |  |  |  |  |  |
| Retail Price Inflation | 3.10 |  |  | 3.20 |  |  | 3.30 |  |  | n/a |  | n/a |  | n/a |
| Consumer Price Inflation | 2.00 |  |  | 2.10 |  |  | 2.20 |  |  | n/a |  | n/a |  | n/a |
| Pension increases |  |  |  |  |  |  |  |  |  |  |  |
| Pre 6 April 1997 | 1.80 |  |  | 1.90 |  |  | 2.00 |  |  | n/a |  | n/a |  | n/a |
| 1997 - 2005 | 2.10 |  |  | 2.10 |  |  | 2.20 |  |  | n/a |  | n/a |  | n/a |
| Post 5 April 2005 | 1.60 |  |  | 1.70 |  |  | 1.80 |  |  | n/a |  | n/a |  | n/a |
| Post-2030 |  |  |  |  |  |  |  |  |  |  |  |
| Retail Price Inflation | 3.10 |  |  | 3.20 |  |  | 3.30 |  |  | n/a |  | n/a |  | n/a |
| Consumer Price Inflation | 3.00 |  |  | 3.10 |  |  | 3.20 |  |  | n/a |  | n/a |  | n/a |
| Pension increases |  |  |  |  |  |  |  |  |  |  |  |
| Pre 6 April 1997 | 2.30 |  |  | 2.40 |  |  | 2.50 |  |  | n/a |  | n/a |  | n/a |
| 1997 - 2005 | 2.90 |  |  | 3.00 |  |  | 3.10 |  |  | n/a |  | n/a |  | n/a |
| Post 5 April 2005 | 2.00 |  |  | 2.20 |  |  | 2.20 |  |  | n/a |  | n/a |  | n/a |
|  | 2023 |  | 2022 |
| Other principal actuarial assumptions: | Years |  | Years |
| Life expectancy of male / female in the U.K. aged 65 at accounting date | 21.2 / 23.1 |  | 21.2 / 23.0 |
| Life expectancy of male / female in the U.K. aged 65 at 20 years after accounting date | 22.5 / 24.6 |  | 22.5 / 24.5 |
Schedule of Allocation of Plan Assets | The fair value of plan assets were:
|  | 2023 |  | 2023 |  | 2023 |  | 2022 |  | 2022 |  | 2022 |
| In millions | U.K. |  | U.S. / other |  | Total |  | U.K. |  | U.S. / other |  | Total |
| Assets in active markets: |  |  |  |  |  |  |  |  |  |  |  |
| Equities and growth funds | $ | 65.7 |  |  | $ | — |  |  | $ | 65.7 |  |  | $ | 78.3 |  |  | $ | — |  |  | $ | 78.3 |  |
| Government bonds | 69.6 |  |  | — |  |  | 69.6 |  |  | 65.7 |  |  | — |  |  | 65.7 |  |
| Corporate bonds | 135.5 |  |  | — |  |  | 135.5 |  |  | 106.1 |  |  | 27.5 |  |  | 133.6 |  |
| Cash | 3.4 |  |  | — |  |  | 3.4 |  |  | 2.5 |  |  | 0.6 |  |  | 3.1 |  |
| Total fair value of plan assets | $ | 274.2 |  |  | $ | — |  |  | $ | 274.2 |  |  | $ | 252.6 |  |  | $ | 28.1 |  |  | $ | 280.7 |  |
Schedule of Expected Benefit Payments | The following benefit payments are expected to be paid by the plans for the years ended December 31 as follows:
| In millions | U.K. pension plans |  |
| 2024 | $ | 13.6 |  |  |
| 2025 | 14.4 |  |  |
| 2026 | 14.6 |  |  |
| 2027 | 14.5 |  |  |
| 2028 | 14.6 |  |  |
| Thereafter | 76.4 |  |  |

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