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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2020
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,
 2020201920202019
 (in millions)
  
Service cost$0.5 $0.4 $1.5 $1.1 
Interest cost5.4 7.1 16.2 21.3 
Expected asset return(9.6)(10.3)(28.9)(30.9)
Amortized loss2.1 1.5 6.4 4.7 
Settlement 0.4  0.4 
Net periodic benefit credit$(1.6)$(0.9)$(4.8)$(3.4)
  
 Other Postretirement Benefits
 Three Months EndedNine Months Ended
 September 30,September 30,
 2020201920202019
 (in millions)
   
Service cost$0.1 $— $0.3 $0.2 
Interest cost2.6 3.3 7.7 9.7 
Amortized loss0.3 — 0.8 0.1 
Amortized prior service credit(0.4)(0.4)(1.2)(1.2)
Net periodic benefit cost$2.6 $2.9 $7.6 $8.8