EMPLOYEE BENEFITS (Tables)

6 Months Ended

Jun. 30, 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 June 30						Six Months Ended June 30
(in millions)	2019			2018			2019			2018
Service cost	$	2.0		$	2.6		$	4.3		$	5.2
Interest cost	7.0			6.5			14.1			13.0
Expected return on plan assets	(12.0		)	(11.9		)	(24.0		)	(24.1		)
Amortization of net actuarial loss	4.5			5.5			8.9			10.5
Net periodic benefit cost	$	1.5		$	2.7		$	3.3		$	4.6

	OPEB Costs
	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2019			2018			2019			2018
Service cost	$	1.0		$	1.5		$	2.1		$	3.1
Interest cost	1.7			2.1			3.3			4.1
Expected return on plan assets	(4.2		)	(4.5		)	(8.3		)	(8.9		)
Amortization of prior service credit	(2.8		)	(2.9		)	(5.7		)	(5.7		)
Amortization of net actuarial loss	0.4			0.6			0.8			1.2
Net periodic benefit credit	$	(3.9	)	$	(3.2	)	$	(7.8	)	$	(6.2	)