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Employee Share-Based Incentive Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2022 and 2021 for performance shares granted under the WTM Incentive Plan:
 Three Months Ended June 30,Six Months Ended June 30,
 2022202120222021
Millions, except share amountsTarget 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 period39,302 $21.9 40,784 $38.2 40,828 $42.2 42,458 $56.3 
Shares paid (1)
— — — — (14,625)(26.4)(14,117)(34.6)
New grants150 — 475 — 13,225 — 13,475 — 
Forfeitures and
  cancellations (2)
(3)(.4)(7)(.2)21 (.1)(564).2 
Expense recognized— 19.7 — 7.7 — 25.5 — 23.8 
End of period39,449 $41.2 41,252 $45.7 39,449 $41.2 41,252 $45.7 
(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 June 30, 2022 for each performance cycle:
Six Months Ended June 30, 2022
Millions, except share amountsTarget Performance
Shares Outstanding		Accrued
Expense
Performance cycle:  
2020 – 202213,350 $27.4 
2021 – 202313,475 11.0 
2022 – 202413,225 3.5 
Sub-total40,050 41.9 
Assumed forfeitures(601)(.7)
June 30, 202239,449 $41.2 
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 and six months ended June 30, 2022 and 2021:
 Three Months Ended June 30,Six Months Ended June 30,
 2022202120222021
Millions, 
except share amounts
Restricted
Shares		Unamortized
Issue Date
Fair Value		Restricted
Shares		Unamortized
Issue Date
Fair Value		Restricted
Shares		Unamortized Issue Date
Fair Value		Restricted
Shares		Unamortized Issue Date
Fair Value
Non-vested,    
Beginning of period38,200 $26.5 37,805 $26.2 37,850 $15.9 43,105 $15.2 
Issued150 .2 475 .5 13,225 13.8 13,475 16.1 
Vested— — — — (12,725)— (17,717)— 
Forfeited— — — — — — (583)(.6)
Expense recognized— (3.7)— (3.5)— (6.7)— (7.5)
End of period38,350 $23.0 38,280 $23.2 38,350 $23.0 38,280 $23.2