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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 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 June 30,
 
 
 
 
 
 
 
Service Cost

$2.3

 

$1.9

 

$1.1

 

$0.9

Interest Cost
6.6

 
6.8

 
2.3

 
2.7

Expected Return on Plan Assets
(8.9
)
 
(8.6
)
 
(2.5
)
 
(2.5
)
Amortization of Prior Service Costs
0.1

 
0.1

 
(0.5
)
 
(0.5
)
Amortization of Net Loss
4.4

 
3.0

 
1.9

 
2.2

Amortization of Transition Obligation
—

 
—

 
0.1

 
0.1

Net Periodic Benefit Expense

$4.5

 

$3.2

 

$2.4

 

$2.9

 
 
 
 
 
 
 
 
For the Six Months Ended June 30,
 
 
 
 
 
 
 
Service Cost

$4.6

 

$3.8

 

$2.1

 

$1.9

Interest Cost
13.2

 
13.7

 
4.7

 
5.4

Expected Return on Plan Assets
(17.7
)
 
(17.3
)
 
(5.0
)
 
(4.9
)
Amortization of Prior Service Costs
0.2

 
0.2

 
(0.9
)
 
(0.9
)
Amortization of Net Loss
8.7

 
6.0

 
3.8

 
4.3

Amortization of Transition Obligation
—

 
—

 
0.1

 
0.1

Net Periodic Benefit Expense

$9.0

 

$6.4

 

$4.8

 

$5.9