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Restructuring
 9 Months Ended
Sep. 30, 2025
Restructuring and Related Activities [Abstract]  
Restructuring Restructuring
In the nine months ended September 30, 2025, a restructuring charge of $82.3 million (September 30, 2024: $45.8 million) was recorded in the Condensed Consolidated Statement of Operations.
The restructuring plan reflected a workforce reduction of $75.6 million (September 30, 2024: $31.7 million) and an office consolidation program to optimize the Company's office footprint of $6.7 million (September 30, 2024: $14.1 million), being the impairment of operating right-off-use assets and related property plant and equipment of $5.6 million (September 30, 2024: $12.6 million) and onerous contract costs of $1.1 million (September 30, 2024: $1.5 million).

 Three Months EndedNine Months Ended
September 30,
2025		September 30,
2024		September 30,
2025		September 30,
2024
 (in thousands)
Restructuring charges$— $— $82,296 $45,789 
Total$— $— $82,296 $45,789 
At September 30, 2025, a total liability of $21.4 million (December 31, 2024: $31.5 million) was recorded on the Condensed Consolidated Balance Sheet relating to restructuring activities.
Nine Months EndedYear
Ended
September 30,
2025		December 31, 2024
(in thousands)
Opening provision$31,474 $6,999 
Charge during the period*76,723 76,392 
Utilization(86,822)(51,917)
Closing provision$21,375 $31,474 
*The charge for the nine months ended September 30, 2025 reflects the workforce reduction of $75.6 million (year ended December 31, 2024: $74.5 million) and onerous contract costs of $1.1 million (year ended December 31, 2024: $1.9 million).
The closing provision as of September 30, 2025 of $21.4 million (December 31, 2024: $31.5 million) reflects:
(1) $17.4 million (December 31, 2024: $27.7 million) of personnel related liabilities as a result of the workforce reduction; all of which have been classified as current within Other Liabilities, and
(2) $4.0 million (December 31, 2024: $3.8 million) of facilities related liabilities of which $1.4 million (December 31, 2024: $1.4 million) is included within Other Liabilities and $2.6 million (December 31, 2024: $2.4 million) is included within Non-Current Other Liabilities.