v3.26.1
EMPLOYEE BENEFITS (Tables)
 6 Months Ended
Jun. 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 June 30Six Months Ended June 30
(in millions)2026202520262025
Service cost$5.1 $4.8 $11.2 $10.5 
Interest cost28.6 29.1 57.2 59.4 
Expected return on plan assets(42.6)(43.6)(85.4)(87.7)
Amortization of prior service credit(0.1)(0.1)(0.1)(0.1)
Amortization of net actuarial loss10.9 9.5 21.3 23.1 
Net periodic benefit cost (credit)$1.9 $(0.3)$4.2 $5.2 

OPEB Benefits
Three Months Ended June 30Six Months Ended June 30
(in millions)2026202520262025
Service cost$3.1 $2.8 $6.2 $5.6 
Interest cost6.5 6.3 13.2 12.8 
Expected return on plan assets(14.5)(13.5)(28.9)(27.1)
Amortization of prior service credit(1.5)(1.8)(2.6)(5.0)
Amortization of net actuarial gain(2.4)(2.3)(4.1)(3.7)
Net periodic benefit credit$(8.8)$(8.5)$(16.2)$(17.4)