Pension and Other Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2012

Pension and Other Postretirement Benefit Plans [Abstract]

Components of Net Periodic Benefit Expense [Table Text Block]

	Pension						Other Postretirement
Components of Net Periodic Benefit Expense	2012			2011			2012			2011
Millions
For the Quarter Ended September 30,
Service Cost		$2.3			$1.9			$1.0			$1.0
Interest Cost	6.6			6.8			2.4			2.7
Expected Return on Plan Assets	(8.9		)	(8.7		)	(2.5		)	(2.4		)
Amortization of Prior Service Costs	—			0.1			(0.4		)	(0.4		)
Amortization of Net Loss	4.4			3.1			1.9			2.1
Net Periodic Benefit Expense		$4.4			$3.2			$2.4			$3.0
For the Nine Months Ended September 30,
Service Cost		$6.9			$5.7			$3.1			$2.9
Interest Cost	19.8			20.5			7.1			8.1
Expected Return on Plan Assets	(26.6		)	(26.0		)	(7.5		)	(7.3		)
Amortization of Prior Service Costs	0.2			0.3			(1.3		)	(1.3		)
Amortization of Net Loss	13.1			9.1			5.7			6.4
Amortization of Transition Obligation	—			—			0.1			0.1
Net Periodic Benefit Expense		$13.4			$9.6			$7.2			$8.9