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Employee Share-Based Incentive Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of performance share activity The following table presents performance share activity for the years ended December 31, 2025, 2024 and 2023 for performance shares granted under the WTM Incentive Plan:
Year Ended December 31,
202520242023
$ in MillionsTarget
Performance
Shares
Outstanding		Accrued
Expense		Target
Performance
Shares
Outstanding		Accrued
Expense		Target
Performance
Shares
Outstanding		Accrued
Expense
Beginning of period34,859 $71.1 37,031 $69.4 39,449 $67.5 
Shares paid or expired (1)
(13,150)(48.7)(13,475)(44.9)(13,350)(40.8)
New grants10,670 — 11,405 — 10,895 — 
Forfeitures and cancellations (2)
37 — (102)— 37 (.1)
Expense recognized— 50.8 — 46.6 — 42.8 
End of period32,416 $73.2 34,859 $71.1 37,031 $69.4 
(1)WTM performance share payments for the 2022-2024 performance cycle were made in March 2025 at 200% of target. WTM performance share payments for the 2021-2023 performance cycle were made in March 2024 at 188% of target. WTM performance share payments for the 2020-2022 performance cycle were made in March 2023 at 200% of target.
(2)Amounts include changes in assumed forfeitures, as required under GAAP.
Schedule of performance shares outstanding and accrued expense for performance shares awarded
The following table presents performance shares outstanding and accrued expense for performance shares awarded under the WTM Incentive Plan as of December 31, 2025 for each performance cycle:
December 31, 2025
$ in MillionsTarget Performance
Shares Outstanding		Accrued Expense
Performance cycle:  
2023 – 202510,835 $41.3 
2024 – 202611,405 23.0 
2025 – 202710,670 10.0 
Sub-total32,910 74.3 
Assumed forfeitures(494)(1.1)
Total32,416 $73.2 
Schedule of unrecognized compensation costs associated with outstanding restricted share awards The following table presents the unrecognized compensation cost associated with the outstanding restricted share awards under the WTM Incentive Plan for the years ended December 31, 2025, 2024 and 2023:
Year Ended December 31,
202520242023
$ in MillionsRestricted
Shares		Unamortized
Issue Date Fair
Value		Restricted
Shares		Unamortized
Issue Date Fair
Value		Restricted
Shares		Unamortized
Issue Date Fair
Value
Non-vested:
Beginning of period35,390 $19.9 37,595 $16.2 38,350 $15.5 
Vested (13,150)— (13,475)— (11,650)— 
Issued10,670 19.6 11,405 20.0 10,895 16.0 
Forfeited— — (135)— — — 
Expense recognized— (18.5)— (16.3)— (15.3)
End of period32,910 $21.0 35,390 $19.9 37,595 $16.2