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Pension and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Retirement Benefits 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,
 2024202320242023
Interest cost$7.4 $7.9 $22.2 $23.4 
Expected return on plan assets(7.9)(7.9)(23.7)(23.4)
Amortization of net gain(0.1)(0.1)(0.5)(0.3)
Net periodic pension and retiree medical income (1)
$(0.6)$(0.1)$(2.0)$(0.3)

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