v3.25.3
Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
Components of net periodic benefit cost for both the Retirement Plans and PBOP were as follows (in millions):
Retirement PlansPBOP
For the
Three Months Ended
September 30,		For the
Three Months Ended
September 30,
2025202420252024
Service cost$0.5 $0.5 $— $— 
Interest cost1.0 1.0 0.3 0.3 
Expected return on plan assets(1.1)(0.8)(0.7)(0.7)
Amortization of unrecognized net loss— 0.1 — — 
Settlement charge0.2 0.2 — — 
Regulatory asset decrease0.3 — — — 
Net periodic benefit cost (credit)
$0.9 $1.0 $(0.4)$(0.4)

Retirement PlansPBOP
For the
Nine Months Ended
September 30,		For the
Nine Months Ended
September 30,
2025202420252024
Service cost$1.4 $1.5 $— $— 
Interest cost2.9 3.0 0.9 0.9 
Expected return on plan assets(3.2)(2.8)(2.1)(2.0)
Amortization of unrecognized net loss0.1 0.5 — — 
Settlement charge0.7 0.6 — — 
Regulatory asset decrease0.4 — — — 
Net periodic benefit cost (credit)
$2.3 $2.8 $(1.2)$(1.1)