Employee Share-Based Incentive Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

The following table presents performance share activity for the years ended December 31, 2019, 2018 and 2017 for performance shares granted under the WTM Incentive Plan:



	Year Ended December 31,
	2019					2018					2017
$ in Millions	Target Performance Shares Outstanding		Accrued Expense			Target Performance Shares Outstanding		Accrued Expense			Target Performance Shares Outstanding		Accrued Expense
Beginning of period	40,616		$	31.7		50,515		$	45.8		80,353		$	42.4
Shares paid or expired ⁽¹⁾	(13,715	)	(18.1		)	(23,186	)	(28.4		)	(30,838	)	(21.9		)
New grants	15,600		—			14,105		—			17,710		—
Forfeitures ⁽²⁾	(28	)	(.1		)	(818	)	.1			(16,710	)	(9.3		)
Expense recognized	—		30.2			—		14.2			—		34.6
End of period ⁽³⁾	42,473		$	43.7		40,616		$	31.7		50,515		$	45.8

⁽¹⁾

WTM performance shares payments in 2019 for the 2016-2018 performance cycle, which were paid in March 2019 ranged from 139% to 166% of target. WTM performance share payments in 2018 for the 2015-2017 performance cycle, which were paid in March 2018 ranged from 145% to 147% of target. WTM performance share payments in 2017 for the 2014-2016 performance cycle, which were paid in March 2017 ranged from 34% to 76% of target.


⁽²⁾	Amounts include changes in assumed forfeitures, as required under GAAP.

⁽³⁾

Outstanding performance share awards as of December 31, 2017 exclude 2,195 unvested performance shares awards for employees of Sirius Group, which are included in discontinued operations.

Summary of performance shares outstanding and accrued expense for performance shares awarded under an Incentive Plan

The following table presents performance shares outstanding and accrued expense for performance shares awarded under the WTM Incentive Plan as of December 31, 2019 for each performance cycle:



$ in Millions	Target Performance Shares Outstanding		Accrued Expense
Performance cycle:
2019 – 2021	15,600		$	6.0
2018 – 2020	13,450		10.5
2017 – 2019	14,070		27.8
Sub-total	43,120		44.3
Assumed forfeitures	(647	)	(.6		)
Total	42,473		$	43.7

Schedule of nonvested restricted stock activity

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, 2019, 2018 and 2017:



	Year Ended December 31,
	2019					2018					2017
$ 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	41,510		$	12.5		53,755		$	14.3		70,620		$	19.7
Issued	15,600		14.5			14,105		11.4			17,985		16.3
Vested	(13,715	)	—			(25,381	)	—			(28,846	)	—
Forfeited	—		—			(969	)	(.2		)	(6,004	)	(3.5		)
Expense recognized	—		(10.3		)	—		(13.0		)	—		(18.2		)
End of period ⁽¹⁾	43,395		$	16.7		41,510		$	12.5		53,755		$	14.3

⁽¹⁾

Outstanding restricted share awards as of December 31, 2017 include 2,195 unvested restricted shares for employees of Sirius Group