Benefits (Tables)

3 Months Ended

Mar. 31, 2015

Components of net periodic pension and OPEB costs



	Pension Costs						OPEB Costs
Benefit Plan Cost Components	2015			2014			2015			2014
	(Millions of Dollars)
Net Periodic Benefit Cost
Service cost	$	3.7		$	2.5		$	2.4		$	2.1
Interest cost	13.3			14.8			3.4			3.6
Expected return on plan assets	(21.0		)	(19.8		)	(4.0		)	(4.0		)
Amortization of:
Prior service cost (credit)	0.5			0.5			(0.3		)	(0.4		)
Actuarial loss	9.0			6.6			0.3			—
Net Periodic Benefit Cost	$	5.5		$	4.6		$	1.8		$	1.3

- Definition

Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

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