v3.26.3
EMPLOYEE BENEFITS (Tables)
 9 Months Ended
Sep. 30, 2026
Retirement Benefits [Abstract]  
Schedule of net benefit cost (credit)
The following tables show the components of net periodic benefit cost (credit) (including amounts capitalized to our balance sheets) for our benefit plans.
Pension Benefits
Three Months Ended September 30Nine Months Ended September 30
(in millions)2026202520262025
Service cost$2.5 $2.5 $7.3 $7.5 
Interest cost11.0 11.4 32.8 34.2 
Expected return on plan assets(14.3)(14.6)(42.8)(44.2)
Amortization of prior service credit(0.1)(0.1)(0.1)(0.1)
Amortization of net actuarial loss4.8 4.0 14.3 12.0 
Net periodic benefit cost$3.9 $3.2 $11.5 $9.4 

OPEB Benefits
Three Months Ended September 30Nine Months Ended September 30
(in millions)2026202520262025
Service cost$1.0 $0.8 $3.0 $2.6 
Interest cost2.5 2.3 7.3 7.0 
Expected return on plan assets(2.8)(2.7)(8.4)(8.1)
Amortization of prior service credit(0.1)— (0.5)(0.1)
Amortization of net actuarial gain(0.8)(0.9)(2.4)(2.9)
Net periodic benefit credit$(0.2)$(0.5)$(1.0)$(1.5)