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Employee Share-Based Incentive Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2022
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, 2022 and 2021 for performance shares granted under the WTM Incentive Plan:
 Three Months Ended March 31,
 20222021
Millions, except share amountsTarget Performance
Shares Outstanding		Accrued
Expense		Target Performance
Shares Outstanding		Accrued
Expense
Beginning of period40,828 $42.2 42,458 $56.3 
Shares paid (1)
(14,625)(26.4)(14,117)(34.6)
New grants13,075 — 13,000 — 
Forfeitures and
  cancellations (2)
24 .3 (557).4 
Expense recognized— 5.8 — 16.1 
End of period39,302 $21.9 40,784 $38.2 
(1) WTM performance share payments in 2022 for the 2019-2021 performance cycle, which were paid in cash in March 2022 at 172% of target.  WTM performance share payments in 2021 for the 2018-2020 performance cycle, which were paid in cash in March 2021 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, 2022 for each performance cycle:
Three Months Ended March 31, 2022
Millions, except share amountsTarget Performance
Shares Outstanding		Accrued
Expense
Performance cycle:  
2020 – 202213,350 $19.0 
2021 – 202313,475 2.9 
2022 – 202413,075 .3 
Sub-total39,900 22.2 
Assumed forfeitures(598)(.3)
March 31, 202239,302 $21.9 
Summary of restricted shares activity
Restricted shares are grants of a specified number of common shares that generally vest at the end of a 34-month service period. The following table presents the unrecognized compensation cost associated with the outstanding restricted share awards for the three months ended March 31, 2022 and 2021:
 Three Months Ended March 31,
 20222021
Millions, 
except share amounts
Restricted
Shares		Unamortized Issue Date
Fair Value		Restricted
Shares		Unamortized Issue Date
Fair Value
Non-vested,    
Beginning of period37,850 $15.9 43,105 $15.2 
Issued13,075 13.6 13,000 15.6 
Vested(12,725)— (17,717)— 
Forfeited— — (583)(.6)
Expense recognized— (3.0)— (4.0)
End of period38,200 $26.5 37,805 $26.2