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Employee Share-Based Incentive Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of performance share activity
The following table presents performance share activity for the three and nine months ended September 30, 2025 and 2024 for performance shares granted under the WTM Incentive Plan:
 Three Months Ended September 30,Nine Months Ended September 30,
 2025202420252024
$ in MillionsTarget Performance
Shares Outstanding		Accrued
Expense		Target Performance
Shares Outstanding		Accrued
Expense		Target Performance
Shares Outstanding		Accrued
Expense		Target Performance
Shares Outstanding		Accrued
Expense
Beginning of period32,392 $29.8 34,992 $52.0 34,859 $71.1 37,031 $69.4 
Shares paid or
   expired (1)
— — — — (13,150)(48.7)(13,475)(44.9)
New grants25 — — — 10,670 — 11,405 — 
Forfeitures and
   cancellations (2)
(1)(.3)(133)— 37 .3 (102).3 
Expense
   recognized
— 22.5 — 3.7 — 29.3 — 30.9 
End of period32,416 $52.0 34,859 $55.7 32,416 $52.0 34,859 $55.7 
(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. 
(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 September 30, 2025 for each performance cycle:
September 30, 2025
$ in MillionsTarget Performance
Shares Outstanding		Accrued
Expense
Performance cycle:  
2023 – 202510,835 $30.6 
2024 – 202611,405 16.5 
2025 – 202710,670 5.7 
Sub-total32,910 52.8 
Assumed forfeitures(494)(.8)
Total32,416 $52.0 
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 three and nine months ended September 30, 2025 and 2024:
 Three Months Ended September 30,Nine Months Ended September 30,
 2025202420252024
$ in MillionsRestricted
Shares		Unamortized
Issue Date
Fair Value		Restricted
Shares		Unamortized
Issue Date
Fair Value		Restricted
Shares		Unamortized Issue Date Fair ValueRestricted
Shares		Unamortized Issue Date Fair Value
Non-vested,    
Beginning of period32,885 $30.7 35,525 $28.8 35,390 $19.9 37,595 $16.2 
Vested— — — — (13,150)— (13,475)— 
Issued25 .1 — — 10,670 19.6 11,405 20.0 
Forfeited— — (135)— — — (135)— 
Expense recognized— (4.9)— (4.5)— (13.6)— (11.9)
End of period32,910 $25.9 35,390 $24.3 32,910 $25.9 35,390 $24.3