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Pension and Other Postretirement Benefits
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
 2023202220232022
Interest cost$7.8 $5.6 $15.5 $11.1 
Expected return on plan assets(7.8)(9.6)(15.5)(19.1)
Amortization of net gain(0.1)(0.1)(0.2)(0.1)
Net periodic pension and retiree medical income (1)
$(0.1)$(4.1)$(0.2)$(8.1)

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