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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 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 EndedSix Months Ended
 June 30,June 30,
 2020201920202019
 (in millions)
  
Service cost$0.5  $0.4  $1.0  $0.7  
Interest cost5.4  7.1  10.8  14.2  
Expected asset return(9.7) (10.3) (19.3) (20.6) 
Amortized loss2.2  1.5  4.3  3.2  
Net periodic benefit credit$(1.6) $(1.3) $(3.2) $(2.5) 
  
 Other Postretirement Benefits
 Three Months EndedSix Months Ended
 June 30,June 30,
 2020201920202019
 (in millions)
   
Service cost$0.1  $0.1  $0.2  $0.2  
Interest cost2.5  3.2  5.1  6.4  
Amortized loss0.3  —  0.5  0.1  
Amortized prior service credit(0.4) (0.4) (0.8) (0.8) 
Net periodic benefit cost$2.5  $2.9  $5.0  $5.9