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Postretirement Benefit Obligations (Tables)

12 Months Ended

Dec. 31, 2024

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures

The following tables summarize the balance sheet impact, including the benefit obligations, assets and funded status associated with the AdvanSix Retirement Earnings Plan.

Change in benefit obligation:			2024						2023						2022
Benefit obligation at January 1,			$	93,270					$	80,174					$	91,389
Service Cost			4,877						4,906						6,860
Interest Cost			4,524						4,048						2,436
Actuarial losses (gains)			(12,285)						6,636						(18,665)
Benefits Paid			(3,098)						(2,494)						(1,846)
Benefit obligation at December 31,			$	87,288					$	93,270					$	80,174
Change in plan assets:
Fair value of plan assets at January 1,			86,084						77,362						71,252
Actual return on plan assets			6,053						11,216						(12,044)
Benefits paid			(3,098)						(2,494)						(1,846)
Company Contributions			—						—						20,000
Fair value of plan assets at December 31,			89,039						86,084						77,362
Under (Over)-Funded status of plan			$	(1,751)					$	7,186					$	2,812
Amounts recognized in Balance Sheet consists of:
Accrued pension liabilities-current (1)			$	—					$	3,526					$	2,812
Accrued pension liabilities-noncurrent (2)			—						3,660						—
Pension asset-noncurrent (3)			(1,751)						—						—
Total pension liabilities (assets) recognized			$	(1,751)					$	7,186					$	2,812

(1) Included in accrued liabilities on Balance Sheet

(2) Included in postretirement benefit obligations on Balance Sheet

(3) Included in other assets on Balance Sheet

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

Pension amount recognized in accumulated other comprehensive loss (income) associated with the Company's pension plan are as follows for:

			Years Ended December 31,
			2024						2023						2022
Transition obligation			$	—					$	—					$	—
Prior service cost			—						—						—
Net actuarial (gain) loss			(14,725)						(1,271)						(1,087)
Pension amounts recognized in other comprehensive loss (income)			$	(14,725)					$	(1,271)					$	(1,087)

Schedule of Net Benefit Costs

The components of net periodic benefit cost and other amounts recognized in other comprehensive income for our pension plan include the following components:

						Years Ended December 31,
						2024						2023						2022
Net periodic pension cost (benefit)
Service cost						$	4,877					$	4,906					$	6,860
Interest cost						4,524						4,048						2,436
Expected return on plan assets						(4,884)						(4,396)						(4,463)
Recognition of actuarial losses						—						—						—
Net periodic Pension Cost						4,517						4,558						4,833
Other changes in benefits obligations recognized in other comprehensive loss (income)
Actuarial losses (gains)						(13,455)						(184)						(2,157)
Total recognized in other comprehensive income						(13,455)						(184)						(2,157)
Total net periodic pension cost (benefit) recognized in Other comprehensive income						$	(8,938)					$	4,374					$	2,676

Schedule of Assumptions Used

Significant actuarial assumptions used in determining the benefit obligations and net periodic benefit cost for our pension plan were as follows:

Key actuarial assumptions used to determine benefit obligations at December 31,						2024			2023			2022
			Effective discount rate for benefit obligation			5.8%			5.1%			5.3%
			Expected annual rate of compensation increase			2.9%			2.9%			2.9%
Key actuarial assumptions used to determine the net periodic benefit cost for the years ended December 31,						2024			2023			2022
			Effective discount rate for service cost			5.1%			5.3%			3.1%
			Effective discount rate for interest cost			4.9%			5.1%			2.7%
			Expected long-term rate of return			6.5%			6.5%			6.5%
			Expected annual rate of compensation increase			2.9%			2.9%			2.4%

Schedule of Expected Benefit Payments

Benefit payments, including amounts to be paid from Company assets, and reflecting expected future service, as appropriate, are expected to be paid during the following years:

2025			$	3,942
2026			4,485
2027			4,985
2028			5,427
2029			6,072
Thereafter			35,584

Schedule of Pension Plan Contributions

The Company made pension plan contributions sufficient to satisfy pension funding requirements under the AdvanSix Retirement Earnings Plan as follows:

			Years Ended December 31,
			2024						2023						2022
1st Quarter			$	—					$	—					$	—
2nd Quarter			—						—						10,000
3rd Quarter			—						—						5,000
4th Quarter			—						—						5,000
Total			$	—					$	—					$	20,000

Schedule of Target Asset Allocation of Pension Plan Assets

The target asset allocation percent for the Company's pension plan assets is summarized as follows:

			Years Ended December 31,
			2024						2023
Cash and cash equivalents			3%						3%
US and non-US equity securities			44%						64%
Fixed income / real estate / other securities			33%						33%
Alternative Equity			20%						—%
Total Pension Assets			100%						100%

Schedule of Fair Value of Plan Assets

			Fair Value at December 31,
Fair Value Measurements			2024						2023						2022
Investments valued using NAV per share
Emerging Markets Region Equities			$	5,184					$	4,839					$	4,427
International Region Equities			17,618						16,975						14,370
United States Equities			41,235						38,324						31,235
United States Bonds			22,034						22,988						20,115
Real Estate			1,360						1,391						1,563
Cash Fund			1,608						1,567						5,652
Total Pension Plan Assets at Fair Value			$	89,039					$	86,084					$	77,362

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