Pension and Other Postretirement Benefit Plans

6 Months Ended

Jun. 30, 2015

Pension and Other Postretirement Benefit Plans [Abstract]

Pension and Other Postretirement Benefit Plans [Text Block]

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS

	Pension						Other Postretirement
Components of Net Periodic Benefit Expense (Income)	2015			2014			2015			2014
Millions
Quarter Ended June 30,
Service Cost		$2.5			$2.1			$1.1			$0.8
Interest Cost	7.4			7.5			1.8			1.9
Expected Return on Plan Assets	(10.1		)	(9.5		)	(2.8		)	(2.6		)
Amortization of Prior Service Costs (Credits)	0.1			—			(0.7		)	(0.6		)
Amortization of Net Loss	4.5			3.5			0.1			0.1
Net Periodic Benefit Expense (Income)		$4.4			$3.6		$(0.5)			$(0.4)
Six Months Ended June 30,
Service Cost		$5.0			$4.2			$2.2			$1.7
Interest Cost	14.9			14.9			3.6			3.7
Expected Return on Plan Assets	(20.3		)	(19.1		)	(5.5		)	(5.2		)
Amortization of Prior Service Costs (Credits)	0.1			0.1			(1.5		)	(1.2		)
Amortization of Net Loss	9.0			7.1			0.2			0.2
Net Periodic Benefit Expense (Income)		$8.7			$7.2		$(1.0)			$(0.8)

Employer Contributions. For the six months ended June 30, 2015, no contributions were made to our defined benefit pension plan ($19.5 million for the six months ended June 30, 2014); we do not expect to make any contributions to our defined benefit pension plan in 2015. For the six months ended June 30, 2015 and 2014, we made no contributions to our other postretirement benefit plan; we do not expect to make any contributions to our other postretirement benefit plan in 2015.