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Pension and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2024
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 March 31,
 20242023
Interest cost$7.4 $7.7 
Expected return on plan assets(7.9)(7.7)
Amortization of net gain(0.2)(0.1)
Net periodic pension and retiree medical income (1)
$(0.7)$(0.1)

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