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Postretirement and Other Benefits
 3 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Postretirement and Other Benefits Postretirement and Other Benefits
The Company sponsors a number of different defined contribution retirement plans, alternative retirement plans and/or defined benefit pension plans across its operations. Defined benefit pension plans are sponsored in the United States, France, United Kingdom, Germany, Italy, Netherlands, and Canada and OPEB benefits related to postretirement healthcare and life insurance are sponsored in the United States, Germany, and Canada. In the prior year quarter ended March 31, 2022, the Company's Canadian postretirement benefits liability and U.S. OPEB liability were immaterial and therefore not included in these disclosures.

In connection with the Merger, the Company assumed Neenah's defined benefit pension and OPEB plans, as well as sponsorship of the defined contribution retirement plan. In addition, Neenah has a supplemental employee retirement plan ("SERP"), which is a non-qualified defined benefit plan, and a supplemental retirement contribution plan ("SRCP"), which is a non-qualified, unfunded defined contribution plan. The Company provides benefits under the non-qualified SERP and SRCP plans to the extent necessary to fulfill the intent of its retirement plans without regard to the limitations set by the Internal Revenue Code on qualified retirement benefit plans.   
Pension and Other Benefits

The components of net pension cost (benefit) during the three months ended March 31, 2023 and 2022 were as follows (in millions):
Pension BenefitsOther Postretirement Plans
 U.S.Non-U.S. U.S.Non-U.S.
Three Months Ended March 31,
 20232022202320222023
Service cost$0.4 $— $0.5 $0.4 $— $0.3 
Interest cost4.4 0.8 2.3 0.6 0.3 — 
Expected return on plan assets(5.5)(1.0)(1.1)(0.6)— — 
Amortizations and other— 0.4 0.1 0.1 — — 
Net pension cost (benefit)$(0.7)$0.2 $1.8 $0.5 $0.3 $0.3 

The components of net pension cost (benefit) other than the service cost component are included in Other income, net in the unaudited Condensed Consolidated Statements of Income (Loss).
The Company's cost under the qualified defined contribution plan was $4.0 million and $2.5 million as of March 31, 2023 and 2022, respectively.