Employee Benefits

9 Months Ended

Sep. 30, 2025

Defined Benefit Retirement Plans (Retirement Plans) and Postretirement Benefits Other Than Pension (PBOP)

Components of net periodic benefit cost for both the Retirement Plans and PBOP were as follows (in millions):


	Retirement Plans				PBOP
	For the Three Months Ended September 30,				For the Three Months Ended September 30,
	2025		2024		2025		2024
Service cost	$	0.5	$	0.5	$	—	$	—
Interest cost	1.0		1.0		0.3		0.3
Expected return on plan assets	(1.1)		(0.8)		(0.7)		(0.7)

Amortization of unrecognized net loss	—		0.1		—		—
Settlement charge	0.2		0.2		—		—
Regulatory asset decrease	0.3		—		—		—
Net periodic benefit cost (credit)	$	0.9	$	1.0	$	(0.4)	$	(0.4)


	Retirement Plans				PBOP
	For the Nine Months Ended September 30,				For the Nine Months Ended September 30,
	2025		2024		2025		2024
Service cost	$	1.4	$	1.5	$	—	$	—
Interest cost	2.9		3.0		0.9		0.9
Expected return on plan assets	(3.2)		(2.8)		(2.1)		(2.0)

Amortization of unrecognized net loss	0.1		0.5		—		—
Settlement charge	0.7		0.6		—		—
Regulatory asset decrease	0.4		—		—		—
Net periodic benefit cost (credit)	$	2.3	$	2.8	$	(1.2)	$	(1.1)

During the nine months ended September 30, 2025, the Company made $2.2 million in contributions to the defined benefit pension plan and expects to fund an additional $0.8 million in the remainder of 2025.

Defined Contribution Plan

Texas Gas Transmission, LLC employees hired on or after November 1, 2006, and all other employees of the Company are provided retirement benefits under a defined contribution plan, which also provides 401(k) plan benefits to its participants. Costs related to the Company's defined contribution plan were $3.8 million and $3.5 million for the three months ended September 30, 2025 and 2024, and $11.4 million and $10.7 million for the nine months ended September 30, 2025 and 2024.

- Definition

The entire disclosure for retirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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+ Details

Boardwalk Pipeline Partners, LP 10-Q