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Pension and Other Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2022
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block] 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.