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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 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 EndedSix Months Ended
 June 30,June 30,
 2023202220232022
 (in millions)
  
Service cost$0.2 $0.4 $0.5 $0.9 
Interest cost6.1 4.2 12.1 8.4 
Expected asset return(7.3)(7.8)(14.5)(15.8)
Amortized loss1.1 1.9 2.1 3.8 
Net periodic benefit cost (credit)$0.1 $(1.3)$0.2 $(2.7)
  
 Other Postretirement Benefits
 Three Months EndedSix Months Ended
 June 30,June 30,
 2023202220232022
 (in millions)
   
Service cost$0.1 $— $0.1 $0.1 
Interest cost2.5 2.1 5.0 4.2 
Amortized loss (gain)(2.1)0.1 (4.2)0.2 
Amortized prior service credit(0.1)(0.2)(0.2)(0.4)
Net periodic benefit cost$0.4 $2.0 $0.7 $4.1