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$5.6 $5.2 $16.8 $15.7 
Interest cost28.7 29.6 85.9 89.0 
Expected return on plan assets(42.8)(43.8)(128.2)(131.5)
Gain on plan settlement(1.0)(0.7)(1.0)(0.7)
Amortization of prior service credit— — (0.1)(0.1)
Amortization of net actuarial loss10.5 9.0 31.8 32.1 
Net periodic benefit cost (credit)$1.0 $(0.7)$5.2 $4.5 
OPEB Benefits
Three Months Ended September 30Nine Months Ended September 30
(in millions)2026202520262025
Service cost$3.1 $2.9 $9.3 $8.5 
Interest cost6.6 6.4 19.8 19.2 
Expected return on plan assets(14.5)(13.6)(43.4)(40.7)
Amortization of prior service credit(1.3)(1.4)(3.9)(6.4)
Amortization of net actuarial gain(2.2)(2.2)(6.3)(5.9)
Net periodic benefit credit$(8.3)$(7.9)$(24.5)$(25.3)