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 30				Six Months Ended June 30
(in millions)	2025		2024		2025		2024
Service cost	$	4.8	$	5.4	$	10.5	$	12.1
Interest cost	29.1		28.8		59.4		58.3
Expected return on plan assets	(43.6)		(45.3)		(87.7)		(91.1)
Amortization of prior service credit	(0.1)		—		(0.1)		—
Amortization of net actuarial loss	9.5		15.3		23.1		29.7
Net periodic benefit cost (credit)	$	(0.3)	$	4.2	$	5.2	$	9.0

	OPEB Benefits
	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2025		2024		2025		2024
Service cost	$	2.8	$	2.6	$	5.6	$	5.4
Interest cost	6.3		5.7		12.8		11.4
Expected return on plan assets	(13.5)		(13.1)		(27.1)		(26.3)
Amortization of prior service credit	(1.8)		(3.4)		(5.0)		(6.8)
Amortization of net actuarial gain	(2.3)		(1.9)		(3.7)		(3.8)
Net periodic benefit credit	$	(8.5)	$	(10.1)	$	(17.4)	$	(20.1)