Pension and Other Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 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 March 31,
Service Cost	$2.3		$1.9		$1.0		$1.0
Interest Cost	6.6		6.9		2.4		2.7
Expected Return on Plan Assets	(8.8	)	(8.7	)	(2.5	)	(2.4	)
Amortization of Prior Service Costs	0.1		0.1		(0.4	)	(0.4	)
Amortization of Net Loss	4.3		3.0		1.9		2.1
Net Periodic Benefit Expense	$4.5		$3.2		$2.4		$3.0