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Pension and Other Postretirement Benefit Plans
 9 Months Ended
Sep. 30, 2012
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
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



Employer Contributions. For the nine months ended September 30, 2012, no contributions were made to our defined benefit pension plan ($6.6 million for the nine months ended September 30, 2011). For the nine months ended September 30, 2012, no contributions were made to our other postretirement benefit plan ($10.9 million for the nine months ended September 30, 2011). We do not expect to make any contributions to our defined benefit pension plan in 2012, and we expect to contribute $8.7 million to our other postretirement benefit plan in 2012. In July 2012, Congress passed legislation which included a pension funding stabilization provision. The provision, which is designed to stabilize the discount rate used to determine funding requirements from the effects of interest rate volatility, will not have a material impact on our contributions in 2012.

Accounting and disclosure requirements for the Medicare Prescription Drug, Improvement and Modernization Act of 2003 (Act) provide guidance for employers that sponsor postretirement health care plans that provide prescription drug benefits. We provide postretirement health benefits that include prescription drug benefits, which qualify for the federal subsidy under the Act. For the nine months ended September 30, 2012, we received $0.3 million in prescription drug reimbursements.