EMPLOYEE BENEFITS (Tables)

6 Months Ended

Jun. 30, 2018

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)	2018			2017			2018			2017
Service cost	$	3.3		$	3.1		$	6.6		$	6.1
Interest cost	10.5			11.6			21.1			23.5
Expected return on plan assets	(18.6		)	(19.1		)	(37.6		)	(38.3		)
Loss on plan settlement	—			2.8			—			2.8
Amortization of prior service cost	0.2			0.3			0.4			0.6
Amortization of net actuarial loss	9.6			8.9			19.0			17.7
Net periodic benefit cost	$	5.0		$	7.6		$	9.5		$	12.4

	OPEB Costs
	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2018			2017			2018			2017
Service cost	$	1.7		$	1.5		$	3.5		$	3.4
Interest cost	2.7			3.1			5.5			6.2
Expected return on plan assets	(3.9		)	(3.6		)	(7.8		)	(7.2		)
Amortization of prior service credit	(0.5		)	(0.3		)	(1.1		)	(0.6		)
Amortization of net actuarial gain	—			(0.3		)	—			—
Net periodic benefit cost	$	—		$	0.4		$	0.1		$	1.8

Schedule of non-service components

The following table shows the non-service (credit) cost components of net benefit costs:

	Three Months Ended June 30					Six Months Ended June 30
(in millions)	2018			2017		2018			2017
Non-service (credit) cost components	$	(1.2	)	$	3.3	$	(2.9	)	$	4.5