EMPLOYEE BENEFITS (Tables)

3 Months Ended

Mar. 31, 2024

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 March 31
(in millions)		2024		2023
Service cost		$	6.7	$	6.6
Interest cost		29.5		30.8
Expected return on plan assets		(45.8)		(47.4)
Amortization of prior service cost		—		0.1
Amortization of net actuarial loss		14.4		7.4
Net periodic benefit cost (credit)		$	4.8	$	(2.5)

	OPEB Benefits
		Three Months Ended March 31
(in millions)		2024		2023
Service cost		$	2.8	$	2.5
Interest cost		5.7		5.4
Expected return on plan assets		(13.2)		(13.3)
Amortization of prior service credit		(3.4)		(3.7)
Amortization of net actuarial gain		(1.9)		(3.2)
Net periodic benefit credit		$	(10.0)	$	(12.3)