EMPLOYEE BENEFITS (Tables)

3 Months Ended

Mar. 31, 2019

Retirement Benefits [Abstract]

Schedule of net benefit costs

The following tables show the components of net periodic pension and OPEB costs for our benefit plans.

	Pension Costs
	Three Months Ended March 31
(in millions)	2019			2018
Service cost	$	11.3		$	12.0
Interest cost	30.6			28.3
Expected return on plan assets	(48.7		)	(49.6		)
Loss on plan settlement	0.8			0.4
Amortization of prior service cost	0.6			0.7
Amortization of net actuarial loss	19.0			23.1
Net periodic benefit cost	$	13.6		$	14.9

	OPEB Costs
	Three Months Ended March 31
(in millions)	2019			2018
Service cost	$	4.4		$	6.2
Interest cost	6.5			7.5
Expected return on plan assets	(13.7		)	(14.9		)
Amortization of prior service credit	(3.9		)	(3.8		)
Amortization of net actuarial (gain) loss	(0.7		)	0.3
Net periodic benefit credit	$	(7.4	)	$	(4.7	)