Employee Share-Based Incentive Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

The following table presents performance share activity for the years ended December 31, 2018, 2017 and 2016 for performance shares granted under the WTM Incentive Plan:



	Year Ended December 31,
	2018					2017					2016
$ in Millions	Target Performance Shares Outstanding		Accrued Expense			Target Performance Shares Outstanding		Accrued Expense			Target Performance Shares Outstanding		Accrued Expense
Beginning of period	50,515		$	45.8		80,353		$	42.4		93,654		$	57.7
Shares paid or expired ⁽¹⁾	(23,186	)	(28.4		)	(30,838	)	(21.9		)	(36,294	)	(41.0		)
New grants	14,105		—			17,710		—			22,615		—
Forfeitures ⁽²⁾	(818	)	.1			(16,710	)	(9.3		)	378		.5
Expense recognized	—		14.2			—		34.6			—		25.2
End of period ⁽³⁾	40,616		$	31.7		50,515		$	45.8		80,353		$	42.4


⁽¹⁾	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. WTM performance shares payments in 2016 for the 2013-2015 performance cycle ranged from 140% to 142% of target.


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


⁽³⁾	Outstanding performance share awards as of December 31, 2018, 2017 and 2016 exclude 0, 2,195 and 7,315 unvested performance shares awards for employees of 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, 2018 for each performance cycle:



$ in Millions	Target Performance Shares Outstanding		Accrued Expense
Performance cycle:
2018 – 2020	13,450		$	3.8
2017 – 2019	14,070		11.9
2016 – 2018	13,715		16.5
Sub-total	41,235		32.2
Assumed forfeitures	(619	)	(.5		)
Total	40,616		$	31.7

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, 2018, 2017 and 2016:



	Year Ended December 31,
	2018					2017					2016
$ 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	53,755		$	14.3		70,620		$	19.7		70,675		$	15.7
Issued	14,105		11.4			17,985		16.3			25,365		20.2
Vested	(25,381	)	—			(28,846	)	—			(24,620	)	—
Forfeited	(969	)	(.2		)	(6,004	)	(3.5		)	(800	)	(.3		)
Expense recognized	—		(13.0		)	—		(18.2		)	—		(15.9		)
End of period ⁽¹⁾	41,510		$	12.5		53,755		$	14.3		70,620		$	19.7


⁽¹⁾	Outstanding restricted share awards as of December 31, 2018, 2017 and 2016 include 0, 2,195, and 5,235 unvested restricted shares for employees of Sirius Group