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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2023
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,
 2023202220232022
 (in millions)
  
Service cost$0.3 $0.5 $0.8 $1.4 
Interest cost6.1 4.1 18.2 12.5 
Expected asset return(7.3)(8.0)(21.8)(23.8)
Amortized loss1.0 2.0 3.1 5.8 
Net periodic benefit cost (credit)$0.1 $(1.4)$0.3 $(4.1)
  
 Other Postretirement Benefits
 Three Months EndedNine Months Ended
 September 30,September 30,
 2023202220232022
 (in millions)
   
Service cost$ $0.1 $0.1 $0.2 
Interest cost2.6 2.1 7.6 6.3 
Amortized loss (gain)(2.1)0.2 (6.3)0.4 
Amortized prior service credit(0.2)(0.3)(0.4)(0.7)
Net periodic benefit cost$0.3 $2.1 $1.0 $6.2