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Pension and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2025
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) loss were as follows (in millions):
Three Months Ended September 30,Nine Months Ended September 30,
 2025202420252024
Interest cost$7.8 $7.4 $23.2 $22.2 
Expected return on plan assets(7.4)(7.9)(21.9)(23.7)
Amortization of net gain(0.2)(0.1)(0.6)(0.5)
Net periodic pension and retiree medical (income) loss (1)
$0.2 $(0.6)$0.7 $(2.0)

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