PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)

9 Months Ended

Sep. 30, 2020

Postemployment Benefits [Abstract]

Schedule of Net Benefit Costs

The following are the components of defined benefit pension and OPEB costs (credits):

Defined Benefit Pension Costs (Credits)

	(In Millions)
	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Service cost	$	5.4	$	4.6	$	16.0	$	12.9
Interest cost	19.6		8.9		42.7		26.2
Expected return on plan assets	(36.7)		(13.7)		(91.9)		(41.0)
Amortization:
Prior service costs	0.2		0.3		0.7		0.9
Net actuarial loss	7.3		5.9		20.6		17.7
Net periodic benefit cost (credit)	$	(4.2)	$	6.0	$	(11.9)	$	16.7

OPEB Costs (Credits)

	(In Millions)
	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Service cost	$	1.4	$	0.5	$	3.3	$	1.3
Interest cost	4.4		2.3		10.9		7.0
Expected return on plan assets	(4.5)		(4.2)		(13.6)		(12.6)
Amortization:
Prior service credits	(0.5)		(0.5)		(1.5)		(1.5)
Net actuarial loss	0.8		1.3		2.2		3.8
Net periodic benefit cost (credit)	$	1.6	$	(0.6)	$	1.3	$	(2.0)