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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2022
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,
 20222021
 (in millions)
  
Service cost$0.5 $0.5 
Interest cost4.2 4.3 
Expected asset return(8.0)(9.7)
Amortized loss1.9 2.7 
Net periodic benefit credit$(1.4)$(2.2)
  
 Other Postretirement Benefits
 Three Months Ended
 March 31,
 20222021
 (in millions)
   
Service cost$0.1 $0.1 
Interest cost2.1 2.1 
Amortized loss0.1 0.4 
Amortized prior service credit(0.2)(0.4)
Net periodic benefit cost$2.1 $2.2