EMPLOYEE BENEFITS (Tables)

3 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

Schedule of net benefit cost (credit)

The following tables show the components of net periodic benefit cost (credit) for our benefit plans.

	Pension Benefits
	Three Months Ended March 31
(in millions)	2021		2020
Service cost	$	13.9	$	13.1
Interest cost	21.9		26.1
Expected return on plan assets	(50.6)		(47.9)
Loss on plan settlement	0.1		0.3
Amortization of prior service cost	0.4		0.4
Amortization of net actuarial loss	27.4		24.2
Net periodic benefit cost	$	13.1	$	16.2

	OPEB Benefits
	Three Months Ended March 31
(in millions)	2021		2020
Service cost	$	4.2	$	4.1
Interest cost	3.6		4.7
Expected return on plan assets	(16.4)		(15.1)
Amortization of prior service credit	(4.0)		(3.7)
Amortization of net actuarial gain	(5.7)		(5.4)
Net periodic benefit credit	$	(18.3)	$	(15.4)