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Employee Share-Based Incentive Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Summary of performance shares outstanding and accrued expense for performance shares awarded under the WTM Incentive Plan
The following table presents the performance share activity for the three months ended March 31, 2024 and 2023 for performance shares granted under the WTM Incentive Plan:
 Three Months Ended March 31,
 20242023
$ in MillionsTarget Performance
Shares Outstanding		Accrued
Expense		Target Performance
Shares Outstanding		Accrued
Expense
Beginning of period37,031 $69.4 39,449 $67.5 
Shares paid (1)
(13,475)(44.9)(13,350)(40.8)
New grants10,405 — 10,895 — 
Forfeitures and cancellations (2)
46 .3 37 .4 
Expense recognized— 19.4 — 9.3 
End of period34,007 $44.2 37,031 $36.4 
(1) 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.
Share-based compensation, performance shares award outstanding activity
The following table presents performance shares outstanding and accrued expense for performance shares awarded under the WTM Incentive Plan as of March 31, 2024 for each performance cycle:
March 31, 2024
$ in MillionsTarget Performance
Shares Outstanding		Accrued
Expense
Performance cycle:  
2022 – 202413,225 $35.0 
2023 – 202510,895 9.4 
2024 – 202610,405 .6 
Sub-total34,525 45.0 
Assumed forfeitures(518)(.8)
Total34,007 $44.2 
Unrecognized compensation cost for 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 months ended March 31, 2024 and 2023:
 Three Months Ended March 31,
 20242023
$ in MillionsRestricted
Shares		Unamortized Issue 
Date Fair Value		Restricted
Shares		Unamortized Issue 
Date Fair Value
Non-vested,    
Beginning of period37,595 $16.2 38,350 $15.5 
Issued10,405 18.3 10,895 16.0 
Vested(13,475)— (11,650)— 
Forfeited— — — — 
Expense recognized— (3.2)— (3.2)
End of period34,525 $31.3 37,595 $28.3