PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)

9 Months Ended

Sep. 30, 2019

Postemployment Benefits [Abstract]

Schedule of Net Benefit Costs

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

Defined Benefit Pension Costs

	(In Millions)
	Three Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Service cost	$	4.6		$	4.7		$	12.9		$	14.0
Interest cost	8.9			7.6			26.2			22.7
Expected return on plan assets	(13.7		)	(15.0		)	(41.0		)	(45.0		)
Amortization:
Prior service costs	0.3			0.6			0.9			1.7
Net actuarial loss	5.9			5.3			17.7			15.9
Net periodic benefit cost	$	6.0		$	3.2		$	16.7		$	9.3

Other Postretirement Employment Benefits Credits

	(In Millions)
	Three Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Service cost	$	0.5		$	0.6		$	1.3		$	1.6
Interest cost	2.3			2.1			7.0			6.2
Expected return on plan assets	(4.2		)	(4.6		)	(12.6		)	(13.8		)
Amortization:
Prior service credits	(0.5		)	(0.7		)	(1.5		)	(2.2		)
Net actuarial loss	1.3			1.3			3.8			3.8
Net periodic benefit credit	$	(0.6	)	$	(1.3	)	$	(2.0	)	$	(4.4	)