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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2013
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
2013
 
2012
 
2013
 
2012
Millions
 
 
 
 
 
 
 
For the Quarter Ended June 30,
 
 
 
 
 
 
 
Service Cost

$2.5

 

$2.3

 

$1.0

 

$1.1

Interest Cost
6.5

 
6.6

 
1.7

 
2.3

Expected Return on Plan Assets
(8.8
)
 
(8.9
)
 
(2.4
)
 
(2.5
)
Amortization of Prior Service Costs
—

 
0.1

 
(0.7
)
 
(0.5
)
Amortization of Net Loss
5.4

 
4.4

 
0.4

 
1.9

Amortization of Transition Obligation
—

 
—

 
—

 
0.1

Net Periodic Benefit Expense

$5.6

 

$4.5

 
—

 

$2.4

 
 
 
 
 
 
 
 
For the Six Months Ended June 30,
 
 
 
 
 
 
 
Service Cost

$5.0

 

$4.6

 

$2.0

 

$2.1

Interest Cost
13.0

 
13.2

 
3.4

 
4.7

Expected Return on Plan Assets
(17.6
)
 
(17.7
)
 
(4.9
)
 
(5.0
)
Amortization of Prior Service Costs
0.1

 
0.2

 
(1.3
)
 
(0.9
)
Amortization of Net Loss
10.7

 
8.7

 
0.8

 
3.8

Amortization of Transition Obligation
—

 
—

 
—

 
0.1

Net Periodic Benefit Expense

$11.2

 

$9.0

 
—

 

$4.8