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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2023
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,
 20232022
 (in millions)
 
Service cost$0.3 $0.5 
Interest cost6.0 4.2 
Expected asset return(7.2)(8.0)
Amortized loss1.0 1.9 
Net periodic benefit cost (credit)$0.1 $(1.4)
 
 Other Postretirement Benefits
 Three Months Ended
 March 31,
 20232022
 (in millions)
 
Service cost$ $0.1 
Interest cost2.5 2.1 
Amortized loss (gain)(2.1)0.1 
Amortized prior service credit(0.1)(0.2)
Net periodic benefit cost$0.3 $2.1