Employee Share-Based Incentive Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

The following table presents performance share activity for the years ended December 31, 2021, 2020 and 2019 for performance shares granted under the WTM Incentive Plan:


	Year Ended December 31,
	2021			2020			2019
$ in Millions	Target Performance Shares Outstanding	Accrued Expense		Target Performance Shares Outstanding	Accrued Expense		Target Performance Shares Outstanding	Accrued Expense
Beginning of period	42,458	$	56.3	42,473	$	43.7	40,616	$	31.7
Shares paid or expired (1)	(14,336)	(35.2)		(14,070)	(27.7)		(13,715)	(18.1)
New grants	13,475	—		14,055	—		15,600	—
Forfeitures and cancellations (2)	(769)	.4		—	(.4)		(28)	(.1)

Expense recognized	—	20.7		—	40.7		—	30.2
End of period	40,828	$	42.2	42,458	$	56.3	42,473	$	43.7

(1)WTM performance share payments in 2021 for the 2018-2020 performance cycle, which were paid in March 2021 at 200% of target.

WTM performance share payments in 2020 for the 2017-2019 performance cycle, which were paid in March 2020, ranged from 174% to 180% of target.

WTM performance share payments in 2019 for the 2016-2018 performance cycle, which were paid in March 2019, ranged from 139% to 166% 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 December 31, 2021 for each performance cycle:


$ in Millions	Target Performance Shares Outstanding	Accrued Expense
Performance cycle:
2019 – 2021	14,625	$	25.3
2020 – 2022	13,350	15.4
2021 – 2023	13,475	2.1
Sub-total	41,450	42.8
Assumed forfeitures	(622)	(.6)
Total	40,828	$	42.2

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 years ended December 31, 2021, 2020 and 2019:


	Year Ended December 31,
	2021			2020			2019
$ in Millions	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 period	43,105	$	15.2	43,395	$	16.7	41,510	$	12.5
Issued	13,475	16.1		14,055	15.1		15,600	14.5
Vested	(17,936)	—		(14,345)	—		(13,715)	—
Forfeited	(794)	(.8)		—	—		—	—

Expense recognized	—	(14.6)		—	(16.6)		—	(10.3)
End of period	37,850	$	15.9	43,105	$	15.2	43,395	$	16.7