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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 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 Ended
 March 31,
 20202019
 (in millions)
 
Service cost$0.5  $0.4  
Interest cost5.4  7.1  
Expected asset return(9.6) (10.3) 
Amortized loss2.1  1.5  
Net periodic benefit credit$(1.6) $(1.3) 
 
 Other Postretirement Benefits
 Three Months Ended
 March 31,
 20202019
 (in millions)
 
Service cost$0.1  $0.1  
Interest cost2.6  3.2  
Amortized loss0.2  —  
Amortized prior service credit(0.4) (0.4) 
Net periodic benefit cost$2.5  $2.9