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Pension and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2023
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,Nine Months Ended September 30,
 2023202220232022
Interest cost$7.9 $5.7 $23.4 $16.8 
Expected return on plan assets(7.9)(9.7)(23.4)(28.8)
Amortization of net gain(0.1)— (0.3)(0.1)
Net periodic pension and retiree medical income (1)
$(0.1)$(4.0)$(0.3)$(12.1)

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