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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Net Benefit (Credits) Costs [Table Text Block] The components of net periodic benefit cost (credit) are as follows:
 Pension Benefits
 Three Months Ended
 March 31,
 20252024
 (in millions)
 
Service cost$0.1 $0.3 
Interest cost6.0 5.8 
Expected asset return(6.4)(7.2)
Amortized loss2.1 1.7 
Net periodic benefit cost$1.8 $0.6 
 
 Other Postretirement Benefits
 Three Months Ended
 March 31,
 20252024
 (in millions)
 
Service cost$ $— 
Interest cost2.3 2.1 
Amortized gain(2.3)(2.5)
Amortized prior service credit(0.2)(0.1)
Net periodic benefit credit$(0.2)$(0.5)