v3.26.3
Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2026
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,
2026202520262025
Service cost$0.4 $0.5 $— $— 
Interest cost0.8 1.0 0.4 0.3 
Expected return on plan assets(0.9)(1.1)(0.7)(0.7)
Settlement charge— 0.2 — — 
Amortization of prior service cost
— — 0.4 — 
Regulatory asset decrease0.4 0.3 — — 
Net periodic benefit cost (credit)
$0.7 $0.9 $0.1 $(0.4)

Retirement PlansPBOP
For the
Nine Months Ended
September 30,		For the
Nine Months Ended
September 30,
2026202520262025
Service cost$1.3 $1.4 $— $— 
Interest cost2.5 2.9 1.1 0.9 
Expected return on plan assets(2.9)(3.2)(2.1)(2.1)
Amortization of unrecognized net loss0.1 0.1 — — 
Settlement charge0.2 0.7 — — 
Amortization of prior service cost
— — 1.2 — 
Regulatory asset decrease0.5 0.4 — — 
Net periodic benefit cost (credit)
$1.7 $2.3 $0.2 $(1.2)