EMPLOYEE BENEFITS (Tables)

6 Months Ended

Jun. 30, 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 June 30				Six Months Ended June 30
(in millions)	2021		2020		2021		2020
Service cost	$	3.9	$	2.9	$	7.2	$	6.2
Interest cost	7.7		9.4		15.5		18.9
Expected return on plan assets	(17.4)		(17.3)		(35.1)		(34.7)
Amortization of prior service credit	(0.1)		—		(0.1)		—
Amortization of net actuarial loss	11.0		9.8		21.0		18.9
Net periodic benefit cost	$	5.1	$	4.8	$	8.5	$	9.3

	OPEB Benefits
	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2021		2020		2021		2020
Service cost	$	0.9	$	1.0	$	2.1	$	2.1
Interest cost	1.4		1.7		2.7		3.4
Expected return on plan assets	(4.2)		(3.9)		(8.4)		(7.8)
Amortization of prior service credit	(0.3)		(0.2)		(0.6)		(0.3)
Amortization of net actuarial gain	(2.8)		(2.9)		(5.5)		(5.3)
Net periodic benefit credit	$	(5.0)	$	(4.3)	$	(9.7)	$	(7.9)