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Pension and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2023
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
March 31,
 20232022
Interest cost$7.7 $5.5 
Expected return on plan assets(7.7)(9.5)
Amortization of net gain(0.1)— 
Net periodic pension and retiree medical income (1)
$(0.1)$(4.0)

(1)Included in Other, net, in our Condensed Consolidated Statements of Operations.