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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2024
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 EndedNine Months Ended
 September 30,September 30,
 2024202320242023
 (in millions)
  
Service cost$0.3 $0.3 $0.8 $0.8 
Interest cost5.8 6.1 17.4 18.2 
Expected asset return(7.2)(7.3)(21.5)(21.8)
Amortized loss1.7 1.0 5.1 3.1 
Net periodic benefit cost$0.6 $0.1 $1.8 $0.3 
  
 Other Postretirement Benefits
 Three Months EndedNine Months Ended
 September 30,September 30,
 2024202320242023
 (in millions)
   
Service cost$ $— $0.1 $0.1 
Interest cost2.1 2.6 6.3 7.6 
Amortized gain(2.5)(2.1)(7.5)(6.3)
Amortized prior service credit(0.1)(0.2)(0.3)(0.4)
Net periodic benefit cost (credit)$(0.5)$0.3 $(1.4)$1.0