Share-Based Payments (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Schedule of Compensation Expense and Related Tax Benefit Recognized During Each Period, and Compensation Cost Expense in Future Periods

The following table provides a summary of compensation expense and the total related tax benefit recognized during each period as well as estimated compensation cost that will be charged to expense in future periods.

	Share-Based Compensation Expense						Unrecognized Compensation Cost
	Year Ended December 31						December 31, 2022
($ in millions, except remaining recognition period)	2022		2021		2020		Amount		Weighted Average Remaining Recognition Period
Total share-based compensation expense	$	4.8	$	4.4	$	3.8	$	6.5	1.7
Tax benefit recognized	$	1.0	$	0.9	$	0.8

Schedule of Activity for Restricted Share Units

Activity for restricted share units during 2022, 2021 and 2020 is summarized below. Grant date fair values are based on the market value of a share of ProAssurance common stock on the date of grant less the estimated net present value of expected dividends during the vesting period.

	2022			2021			2020
	Units	Weighted Average Grant Date Fair Value		Units	Weighted Average Grant Date Fair Value		Units	Weighted Average Grant Date Fair Value
Beginning non-vested balance	387,182	$	30.78	339,804	$	36.09	320,625	$	43.99
Granted	195,941	$	24.19	131,521	$	24.16	111,758	$	29.18
Forfeited	(12,238)	$	25.13	(11,131)	$	35.49	(9,054)	$	40.13
Vested and released	(105,682)	$	39.36	(73,012)	$	44.45	(83,525)	$	56.74
Ending non-vested balance	465,203	$	26.21	387,182	$	30.78	339,804	$	36.09

Schedule of Activity for Performance Share Awards

The table reflects the base number of units; actual awards that vest depend upon the extent to which performance objectives are achieved. Grant date fair values are based on the market value of a share of ProAssurance common stock on the date of grant less the estimated net present value of expected dividends during the vesting period.

	2022			2021			2020
	Base Units	Weighted Average Grant Date Fair Value		Base Units	Weighted Average Grant Date Fair Value		Base Units	Weighted Average Grant Date Fair Value
Beginning non-vested balance	137,781	$	28.43	90,979	$	36.87	100,370	$	50.10
Granted	109,542	$	24.19	74,004	$	24.04	38,609	$	29.18
Forfeited	—	$	—	—	$	—	—	$	—
Expired*	(25,168)	$	40.18	(27,202)	$	44.73	(48,000)	$	58.35
Ending non-vested balance	222,155	$	25.01	137,781	$	28.43	90,979	$	36.87

*Represents performance share units that did not vest as minimum performance objectives were not achieved.