Pension and Other Postretirement Benefit Plans

9 Months Ended

Sep. 30, 2016

Compensation and Retirement Disclosure [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)	2016			2015			2016			2015
Millions
Quarter Ended September 30,
Service Cost		$2.0			$2.6			$1.0			$1.0
Interest Cost	8.2			7.5			1.9			1.8
Expected Return on Plan Assets	(10.7		)	(10.2		)	(2.8		)	(2.7		)
Amortization of Prior Service Credits	—			—			(0.7		)	(0.7		)
Amortization of Net Loss	2.4			4.4			—			0.1
Net Periodic Benefit Expense (Income)		$1.9			$4.3		$(0.6)			$(0.5)
Nine Months Ended September 30,
Service Cost		$6.1			$7.6			$3.0			$3.2
Interest Cost	24.4			22.4			5.6			5.4
Expected Return on Plan Assets	(32.0		)	(30.5		)	(8.4		)	(8.2		)
Amortization of Prior Service Costs (Credits)	—			0.1			(2.2		)	(2.2		)
Amortization of Net Loss	7.3			13.4			0.1			0.3
Net Periodic Benefit Expense (Income)		$5.8			$13.0		$(1.9)			$(1.5)

NOTE 12. PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Continued)

Employer Contributions. For the nine months ended September 30, 2016, we contributed $6.3 million in cash to our defined benefit pension plan (none for the nine months ended September 30, 2015); we do not expect to make additional contributions to our defined benefit pension plan in 2016. For the nine months ended September 30, 2016, and 2015, 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 2016.