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Retirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2025

Retirement Benefits [Abstract]

Changes in Benefit Obligations and Plan Assets

The following tables detail the changes in the benefit obligations and plan assets of the defined benefit plans for the years ended December 31, 2025 and 2024, as well as the funded status of the plans at each year end and the amounts recognized in the Company’s Consolidated Balance Sheets. The Company uses a December 31 measurement date for all defined benefit pension plans and other postretirement benefit plans.

	Pension Benefits								Other Post-Retirement Benefits
($ in thousands)	2025			2024					2025			2024
Change in benefit obligation
Benefit obligation at beginning of year	$	486,231			$	517,648			$	10,447			$	13,404
Service cost		6,061				7,707				24				31
Interest cost		25,086				24,047				520				578
Plan participants' contributions		—				—				549				608
Plan amendments		—				—				369				—
Net actuarial gain (loss)		16,517				(35,453	)			170				(2,371	)
Benefits paid		(27,988	)			(27,718	)			(1,469	)			(1,803	)
Benefit obligation, end of year		505,907				486,231				10,610				10,447
Change in plan assets
Fair value of plan assets at beginning of year		734,820				723,064				—				—
Actual return on plan assets		81,135				40,388				—				—
Employer contributions		1,320				1,264				920				1,196
Plan participants' contributions		—				—				549				608
Benefit payments		(27,988	)			(27,718	)			(1,469	)			(1,804	)
Expenses		(2,286	)			(2,178	)			—				—
Fair value of plan assets, end of year		787,001				734,820				—				—
Funded status at end of year - net asset (liability)	$	281,094			$	248,589			$	(10,610	)		$	(10,447	)
Amounts recognized in accumulated other comprehensive loss
Unrecognized loss (gain) at beginning of year	$	109,324			$	141,049			$	(9,474	)		$	(7,902	)
Net actuarial loss (gain)		(21,678	)			(31,725	)			1,166				(1,572	)
Unrecognized loss (gain) at end of year	$	87,646			$	109,324			$	(8,308	)		$	(9,474	)
Projected benefit obligation	$	505,907			$	486,231
Accumulated benefit obligation		488,780				467,634
Fair value of plan assets		787,001				734,820

Components of Net Periodic (Benefits) Cost

The following table shows net periodic (benefit) cost included in expense and the changes in the amounts recognized in AOCI during the years ended December 31, 2025, 2024, and 2023.

		Pension Benefits										Other Post-Retirement Benefits
($ in thousands)		2025			2024			2023				2025			2024			2023
Net periodic (benefit) cost
Service cost		$	6,061		$	7,707		$	7,916			$	24		$	31		$	34
Interest cost			25,086			24,047			23,854				520			578			622
Expected return on plan assets			(45,059	)		(47,626	)		(44,710	)			—			—			—
Amortization of net (gain) loss/prior service cost			4,404			5,687			7,643				(1,123	)		(799	)		(843	)
Net periodic benefit			(9,508	)		(10,185	)		(5,297	)			(579	)		(190	)		(187	)
Other changes in plan assets and benefit    obligations recognized in other    comprehensive income, before taxes
Net (loss) gain recognized during the year			(4,404	)		(5,687	)		(7,643	)			1,123			799			843
Net actuarial loss (gain)			(17,274	)		(26,038	)		13,449				43			(2,371	)		92
Total recognized in other comprehensive    income			(21,678	)		(31,725	)		5,806				1,166			(1,572	)		935
Total recognized in net periodic benefit    cost and other comprehensive income		$	(31,186	)	$	(41,910	)	$	509			$	587		$	(1,762	)	$	748
Discount rate for benefit obligations			5.35	%		5.62	%		4.83	%			5.28	%		5.56	%		4.81	%
Discount rate for net periodic benefit cost			5.62	%		4.83	%		5.00	%			5.56	%		4.81	%		4.98	%
Expected long-term return on plan assets			6.25	%		6.50	%		6.50	%		n/a			n/a			n/a
Rate of compensation increase		scaled *			scaled *			scaled *				n/a			n/a			n/a

*Graded scale, declining from 7.25% at age 20 to 2.25% at age 65

Expected Plan Benefit Payments

The following table presents expected plan benefit payments over the ten years succeeding December 31, 2025:

($ in thousands)	Pension			Post-Retirement			Total
2026	$	30,922		$	837		$	31,759
2027		32,352			873			33,225
2028		33,579			885			34,464
2029		34,791			852			35,643
2030		36,008			817			36,825
2031-2035		190,109			3,772			193,881
.	$	357,761		$	8,036		$	365,797

Fair Values of Pension Plan Assets

For all investments, the plan attempts to use quoted market prices of identical assets on active exchanges, or Level 1 measurements. Where such quoted market prices are not available, the plan will use quoted prices for similar instruments or discounted cash flows to estimate the value, reported as Level 2.

	December 31, 2025
Fair Value Measurements by Asset Category / Fund	Level 1			Level 2			Level 3			Total
($ in thousands)
Cash and equivalents	$	5,732		$	—		$	—		$	5,732
Total cash and cash equivalents		5,732			—			—			5,732
Fixed income securities		37,238			34,384			—			71,622
Exchange Traded Fund (ETF)-Fixed income		4,834			—			—			4,834
Total fixed income		42,072			34,384			—			76,456
Domestic and foreign stock		50,646			—			—			50,646
Mutual funds-equity		40,900			—			—			40,900
Total equity		91,546			—			—			91,546
Total assets at fair value		139,350			34,384			—			173,734
Collective investment trust fund - equity		—			—			—			62,901
Common trust funds (fixed income)		—			—			—			483,491
Common trust fund (real assets)		—			—			—			66,875
Total	$	139,350		$	34,384		$	—		$	787,001

	December 31, 2024
Fair Value Measurements by Asset Category / Fund	Level 1			Level 2			Level 3			Total
($ in thousands)
Cash and equivalents	$	6,357		$	—		$	—		$	6,357
Total cash and cash equivalents		6,357			—			—			6,357
Fixed income securities		26,476			37,726			—			64,202
Exchange Traded Fund (ETF)-Fixed income		4,133			—			—			4,133
Total fixed income		30,609			37,726			—			68,335
Domestic and foreign stock		48,279			—			—			48,279
Mutual funds-equity		38,812			—			—			38,812
Total equity		87,091			—			—			87,091
Total assets at fair value		124,057			37,726			—			161,783
Common trust funds (fixed income)		—			—			—			514,562
Common trust fund (real assets)		—			—			—			58,475
Total	$	124,057		$	37,726		$	—		$	734,820

Percentage and Target Allocations

The following table presents the percentage allocation of the plan assets by asset category and corresponding target allocations at December 31, 2025 and 2024.

	Plan Assets								Target Allocation
	at December 31,								at December 31,
	2025				2024				2025	2024
Asset category:
Cash and equivalents		1		%		1		%	0 - 5%	0 - 5%
Fixed income securities		71				79			8-72%	8-72%
Equity securities		20				12			16-22%	16-22%
Real assets		8				8			4-10%	4-10%
		100		%		100		%

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Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.

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