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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2021
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,
 20212020
 (in millions)
 
Service cost$0.5 $0.5 
Interest cost4.3 5.4 
Expected asset return(9.7)(9.6)
Amortized loss2.7 2.1 
Net periodic benefit credit$(2.2)$(1.6)
 
 Other Postretirement Benefits
 Three Months Ended
 March 31,
 20212020
 (in millions)
 
Service cost$0.1 $0.1 
Interest cost2.1 2.6 
Amortized loss0.4 0.2 
Amortized prior service credit(0.4)(0.4)
Net periodic benefit cost$2.2 $2.5