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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 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 September 30,
 
 
 
 
 
 
 
Service Cost

$2.4

 

$2.3

 

$0.9

 

$1.0

Interest Cost
6.5

 
6.6

 
1.7

 
2.4

Expected Return on Plan Assets
(8.8
)
 
(8.9
)
 
(2.4
)
 
(2.5
)
Amortization of Prior Service Costs
0.1

 
—

 
(0.6
)
 
(0.4
)
Amortization of Net Loss
5.4

 
4.4

 
0.4

 
1.9

Net Periodic Benefit Expense

$5.6

 

$4.4

 
—

 

$2.4

 
 
 
 
 
 
 
 
For the Nine Months Ended September 30,
 
 
 
 
 
 
 
Service Cost

$7.4

 

$6.9

 

$2.9

 

$3.1

Interest Cost
19.5

 
19.8

 
5.1

 
7.1

Expected Return on Plan Assets
(26.4
)
 
(26.6
)
 
(7.3
)
 
(7.5
)
Amortization of Prior Service Costs
0.2

 
0.2

 
(1.9
)
 
(1.3
)
Amortization of Net Loss
16.1

 
13.1

 
1.2

 
5.7

Amortization of Transition Obligation
—

 
—

 
—

 
0.1

Net Periodic Benefit Expense

$16.8

 

$13.4

 
—

 

$7.2