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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 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 EndedSix Months Ended
 June 30,June 30,
 2022202120222021
 (in millions)
  
Service cost$0.4 $0.5 $0.9 $1.0 
Interest cost4.2 4.3 8.4 8.6 
Expected asset return(7.8)(9.7)(15.8)(19.4)
Amortized loss1.9 2.7 3.8 5.4 
Net periodic benefit credit$(1.3)$(2.2)$(2.7)$(4.4)
  
 Other Postretirement Benefits
 Three Months EndedSix Months Ended
 June 30,June 30,
 2022202120222021
 (in millions)
   
Service cost$ $0.1 $0.1 $0.2 
Interest cost2.1 2.1 4.2 4.2 
Amortized loss0.1 0.4 0.2 0.8 
Amortized prior service credit(0.2)(0.4)(0.4)(0.8)
Net periodic benefit cost$2.0 $2.2 $4.1 $4.4