XML 137 R38.htm IDEA: XBRL DOCUMENT
v3.22.1

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,
|  |  |  |  |  | 2022 |  | 2021
Millions, except share amounts |  |  |  |  |  |  |  |  |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense
Beginning of period |  |  |  |  |  |  |  |  |  | 40,828 |  |  | $ | 42.2 |  |  | 42,458 |  |  | $ | 56.3 |
Shares paid (1) |  |  |  |  |  |  |  |  |  | (14,625) |  |  | (26.4) |  |  | (14,117) |  |  | (34.6) |
New grants |  |  |  |  |  |  |  |  |  | 13,075 |  |  | — |  |  | 13,000 |  |  | — |
Forfeitures and cancellations (2) |  |  |  |  |  |  |  |  |  | 24 |  |  | .3 |  |  | (557) |  |  | .4 |
Expense recognized |  |  |  |  |  |  |  |  |  | — |  |  | 5.8 |  |  | — |  |  | 16.1 |
End of period |  |  |  |  |  |  |  |  |  | 39,302 |  |  | $ | 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 amounts |  | Target Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |
2020 – 2022 |  | 13,350 |  |  | $ | 19.0 |
2021 – 2023 |  | 13,475 |  |  | 2.9 |
2022 – 2024 |  | 13,075 |  |  | .3 |
Sub-total |  | 39,900 |  |  | 22.2 |
Assumed forfeitures |  | (598) |  |  | (.3) |
March 31, 2022 |  | 39,302 |  |  | $ | 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,
|  |  |  |  |  | 2022 |  | 2021
Millions, except share amounts |  |  |  |  |  |  |  |  |  | Restricted Shares |  | Unamortized Issue Date Fair Value |  | Restricted Shares |  | Unamortized Issue Date Fair Value
Non-vested, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period |  |  |  |  |  |  |  |  |  | 37,850 |  |  | $ | 15.9 |  |  | 43,105 |  |  | $ | 15.2 |
Issued |  |  |  |  |  |  |  |  |  | 13,075 |  |  | 13.6 |  |  | 13,000 |  |  | 15.6 |
Vested |  |  |  |  |  |  |  |  |  | (12,725) |  |  | — |  |  | (17,717) |  |  | — |
Forfeited |  |  |  |  |  |  |  |  |  | — |  |  | — |  |  | (583) |  |  | (.6) |
Expense recognized |  |  |  |  |  |  |  |  |  | — |  |  | (3.0) |  |  | — |  |  | (4.0) |
End of period |  |  |  |  |  |  |  |  |  | 38,200 |  |  | $ | 26.5 |  |  | 37,805 |  |  | $ | 26.2 |

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationPerformanceSharesAwardOutstandingActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in nonvested performance shares outstanding and the amount accrued for performance shares. + References No definition available. + Details
Name: | wtm_ScheduleOfNonvestedPerformanceShareActivityTableTextBlock
Namespace Prefix: | wtm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in nonvested restricted shares and the unamortized grant date fair value. + References No definition available. + Details
Name: | wtm_ScheduleofNonvestedRestrictedShareActivityTableTextBlock
Namespace Prefix: | wtm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration