Pension and Other Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2011

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Components of Net Periodic Benefit Expense [Table Text Block]

	Pension		Other Postretirement
Components of Net Periodic Benefit Expense	2011	2010	2011	2010
Millions
For the Quarter Ended September 30,
Service Cost	$1.9	$1.5	$1.0	$1.2
Interest Cost	6.8	6.6	2.7	2.7
Expected Return on Plan Assets	(8.7)	(8.4)	(2.4)	(2.4)
Amortization of Prior Service Costs	0.1	0.1	(0.4)	—
Amortization of Net Loss	3.1	1.6	2.1	1.2
Amortization of Transition Obligation	—	—	—	0.6
Net Periodic Benefit Expense	$3.2	$1.4	$3.0	$3.3
For the Nine Months Ended September 30,
Service Cost	$5.7	$4.6	$2.9	$3.6
Interest Cost	20.5	19.7	8.1	8.2
Expected Return on Plan Assets	(26.0)	(25.2)	(7.3)	(7.2)
Amortization of Prior Service Costs	0.3	0.3	(1.3)	—
Amortization of Net Loss	9.1	4.9	6.4	3.6
Amortization of Transition Obligation	—	—	0.1	1.8
Net Periodic Benefit Expense	$9.6	$4.3	$8.9	$10.0