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Pension and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block] 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,
 2024202320242023
Interest cost$7.4 $7.8 $14.8 $15.5 
Expected return on plan assets(7.9)(7.8)(15.8)(15.5)
Amortization of net gain(0.2)(0.1)(0.4)(0.2)
Net periodic pension and retiree medical income (1)
$(0.7)$(0.1)$(1.4)$(0.2)

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