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Pension and Other Postretirement Benefits
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
 2025202420252024
Interest cost$7.8 $7.4 $15.4 $14.8 
Expected return on plan assets(7.3)(7.9)(14.5)(15.8)
Amortization of net gain(0.2)(0.2)(0.4)(0.4)
Net periodic pension and retiree medical (income) loss (1)
$0.3 $(0.7)$0.5 $(1.4)

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