v3.25.2
Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2025
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,
 2025202420252024
 (in millions)
  
Service cost$ $0.2 $0.1 $0.5 
Interest cost6.0 5.8 12.0 11.6 
Expected asset return(6.4)(7.1)(12.8)(14.3)
Amortized loss2.2 1.7 4.3 3.4 
Net periodic benefit cost$1.8 $0.6 $3.6 $1.2 
  
 Other Postretirement Benefits
 Three Months EndedSix Months Ended
 June 30,June 30,
 2025202420252024
 (in millions)
   
Service cost$ $0.1 $ $0.1 
Interest cost2.2 2.1 4.5 4.2 
Amortized gain(2.4)(2.5)(4.7)(5.0)
Amortized prior service credit(0.1)(0.1)(0.3)(0.2)
Net periodic benefit credit$(0.3)$(0.4)$(0.5)$(0.9)