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Pension and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2022
Retirement Benefits [Abstract]  
Retirement Benefits [Text Block] Pension and Other Post-retirement Benefits
We have defined-benefit pension plans and retiree medical plans that provide post-retirement health and life insurance benefits.

The components of net periodic pension and retiree medical income were as follows (in millions):
Three Months Ended
September 30,
 20222021
Interest cost$5.7 $5.8 
Expected return on plan assets(9.7)(9.5)
Net periodic pension and retiree medical income (1)
$(4.0)$(3.7)

SuccessorPredecessor
 Nine Months Ended September 30, 2022Five Months Ended September 30, 2021Four Months Ended April 30, 2021
Interest cost$16.8 $9.6 $6.6 
Expected return on plan assets(28.8)(15.7)(12.1)
Amortization of net loss(0.1)— 0.1 
Net periodic pension and retiree medical income (1)
$(12.1)$(6.1)$(5.4)

(1)Included in Other, net, in our Condensed Consolidated Statements of Operations.
In March 2021, the American Rescue Plan Act of 2021 ("ARPA-21") was passed. ARPA-21 provides funding relief for U.S. qualified pension plans which lower pension contribution requirements over the next few years. During the nine months ended September 30, 2022 (Successor), we contributed or directly paid $3.3 million to our pension and other post-retirement benefit plans. We currently expect to contribute or directly pay $1.7 million to our pension and other post-retirement benefits plans for the remainder of 2022. These amounts represent the minimum contributions we are required to make under relevant statutes. We do not expect to make contributions in excess of the minimum required amounts.