Employee Share-Based Incentive Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2020

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 nine months ended September 30, 2020 and 2019 for performance shares granted under the WTM Incentive Plan:



	Three Months Ended September 30,							Nine Months Ended September 30,
	2020				2019			2020					2019
Millions, except share amounts	Target 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 period	42,458	$	15.8		42,473	$	30.8	42,473		$	43.7		40,616		$	31.7
Shares paid ⁽¹⁾	—	—			—	—		(14,070	)	(27.7		)	(13,715	)	(18.1		)
New grants	—	—			—	—		14,055		—			15,600		—
Forfeitures and cancellations⁽²⁾	—	(.3		)	—	—		—		.1			(28	)	—
Expense recognized	—	13.6			—	5.6		—		13.0			—		22.8
End of period	42,458	$	29.1		42,473	$	36.4	42,458		$	29.1		42,473		$	36.4

⁽¹⁾WTM performance share payments in 2020 for the 2017-2019 performance cycle, which were paid in cash 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 cash in March 2019, ranged from 139% to 166% 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 September 30, 2020 for each performance cycle:



	Nine Months Ended September 30, 2020
Millions, except share amounts	Target Performance Shares Outstanding		Accrued Expense
Performance cycle:
2018 – 2020	13,450		$	15.4
2019 – 2021	15,600		10.6
2020 – 2022	14,055		3.6
Sub-total	43,105		29.6
Assumed forfeitures	(647	)	(.5		)
September 30, 2020	42,458		$	29.1

Summary of restricted shares activity

The following table presents the unrecognized compensation cost associated with the outstanding restricted share awards for the three and nine months ended September 30, 2020 and 2019:



	Three Months Ended September 30,								Nine Months Ended September 30,
	2020				2019				2020					2019
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 period	43,105	$	23.0		43,395	$	21.9		43,395		$	16.7		41,510		$	12.5
Issued	—	—			—	—			14,055		15.1			15,600		14.5
Vested	—	—			—	—			(14,345	)	—			(13,715	)	—
Forfeited	—	—			—	—			—		—			—		—
Expense recognized	—	(3.6		)	—	(2.6		)	—		(12.4		)	—		(7.7		)
End of period	43,105	$	19.4		43,395	$	19.3		43,105		$	19.4		43,395		$	19.3