EMPLOYEE BENEFITS (Tables)

6 Months Ended

Jun. 30, 2020

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)	2020		2019		2020		2019
Service cost	$	11.7	$	11.8	$	24.8	$	23.1
Interest cost	26.1		30.2		52.2		60.8
Expected return on plan assets	(47.7)		(48.2)		(95.6)		(96.9)
Loss on plan settlement	10.0		1.0		10.3		1.8
Amortization of prior service cost	0.4		0.5		0.8		1.1
Amortization of net actuarial loss	25.5		18.7		49.7		37.7
Net periodic benefit cost	$	26.0	$	14.0	$	42.2	$	27.6

	OPEB Benefits
	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2020		2019		2020		2019
Service cost	$	3.5	$	3.8	$	7.6	$	8.2
Interest cost	4.6		6.3		9.3		12.8
Expected return on plan assets	(15.1)		(13.6)		(30.2)		(27.3)
Amortization of prior service credit	(3.8)		(3.8)		(7.5)		(7.7)
Amortization of net actuarial gain	(5.8)		(2.0)		(11.2)		(2.7)
Net periodic benefit credit	$	(16.6)	$	(9.3)	$	(32.0)	$	(16.7)