v3.24.2.u1
Pension and Other Postretirement Benefits
 9 Months Ended
Jun. 30, 2024
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]  
Pension and Other Postretirement benefits PENSION AND OTHER POSTRETIREMENT BENEFITS
The Company maintains qualified defined benefit plans in the U.S., the U.K. and Canada for certain employees primarily within its Post Consumer Brands and Weetabix segments. Certain of the Company’s employees are eligible to participate in the Company’s postretirement benefit plans (partially subsidized retiree health and life insurance).
On February 16, 2024, the Company adopted the Post Holdings, Inc. 2024 Supplemental Executive Retirement Plan (the “SERP”), an unfunded, non-qualified defined benefit retirement plan for certain management employees of the Company, including its named executive officers, that was effective on February 19, 2024. The SERP is a supplemental program that provides a cash balance benefit to each participant. The SERP participants were credited with an opening credit, based on years of past service with the Company, and accrue ongoing benefits with a pay credit equal to a percentage of certain of the participant’s annualized compensation. The Company recorded an initial projected benefit obligation of $8.3 related to the SERP during the second quarter of fiscal 2024, which was included in “Accumulated other comprehensive loss” on the Condensed Consolidated Balance Sheets at June 30, 2024. Net periodic benefit costs related to the SERP during the three and nine months ended June 30, 2024 were immaterial.
Amounts for the Canadian plans and the SERP are included in the North America disclosures and are not disclosed separately because they do not constitute a significant portion of the combined amounts.
The following tables present the components of net periodic benefit cost (income) for the pension plans. Service cost was reported in “Cost of goods sold” and “Selling, general and administrative expenses” and all other components of net periodic benefit cost (income) were reported in “Other income, net” in the Condensed Consolidated Statements of Operations.
North America
Three Months Ended
June 30,		Nine Months Ended
June 30,
2024202320242023
Service cost$0.7 $0.6 $1.7 $1.7 
Interest cost1.5 1.3 4.3 3.9 
Expected return on plan assets(2.0)(1.9)(6.1)(5.7)
Recognized net actuarial gain(0.1)— (0.3)(0.1)
Recognized prior service cost0.3 — 0.4 0.1 
Net periodic benefit cost (income)
$0.4 $— $— $(0.1)

Other International
Three Months Ended
June 30,		Nine Months Ended
June 30,
2024202320242023
Service cost$0.1 $— $0.2 $— 
Interest cost6.5 6.0 19.2 17.3 
Expected return on plan assets(8.8)(7.9)(26.0)(22.9)
Recognized net actuarial loss— — 0.1 0.1 
Recognized prior service cost0.1 0.1 0.3 0.3 
Net periodic benefit income$(2.1)$(1.8)$(6.2)$(5.2)
The following table presents the components of net periodic benefit cost (income) for the North American other postretirement benefit plans. Service cost was reported in “Cost of goods sold” and “Selling, general and administrative expenses” and all other components of net periodic benefit cost (income) were reported in “Other income, net” in the Condensed Consolidated Statements of Operations.
Three Months Ended
June 30,		Nine Months Ended
June 30,
2024202320242023
Service cost$0.1 $0.1 $0.2 $0.2 
Interest cost0.7 0.6 2.0 1.9 
Recognized net actuarial gain(0.3)(0.1)(0.8)(0.4)
Recognized prior service credit(0.2)(1.2)(0.5)(3.5)
Net periodic benefit cost (income)$0.3 $(0.6)$0.9 $(1.8)