XML 49 R38.htm IDEA: XBRL DOCUMENT v3.25.2
EMPLOYEE BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2025
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)2025202420252024
Service cost$0.9 $1.2 $2.1 $2.5 
Interest cost7.7 7.3 15.3 14.7 
Expected return on plan assets(12.4)(12.8)(24.8)(25.5)
Amortization of net actuarial loss0.9 4.3 5.2 8.6 
Net periodic benefit cost (credit)$(2.9)$— $(2.2)$0.3 

 OPEB Benefits
 Three Months Ended June 30Six Months Ended June 30
(in millions)2025202420252024
Service cost$0.8 $0.7 $1.5 $1.5 
Interest cost1.9 1.7 3.7 3.3 
Expected return on plan assets(4.5)(4.4)(9.0)(8.7)
Amortization of prior service credit(1.1)(2.6)(3.6)(5.1)
Amortization of net actuarial loss0.2 0.7 0.8 1.2 
Net periodic benefit credit$(2.7)$(3.9)$(6.6)$(7.8)