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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2014
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 (Income)
2014
 
2013
 
2014
 
2013
Millions
 
 
 
 
 
 
 
For the Quarter Ended June 30,
 
 
 
 
 
 
 
Service Cost

$2.1

 

$2.5

 

$0.8

 

$1.0

Interest Cost
7.5

 
6.5

 
1.9

 
1.7

Expected Return on Plan Assets
(9.5
)
 
(8.8
)
 
(2.6
)
 
(2.4
)
Amortization of Prior Service Credits
—

 
—

 
(0.6
)
 
(0.7
)
Amortization of Net Loss
3.5

 
5.4

 
0.1

 
0.4

Net Periodic Benefit Expense (Income)

$3.6

 

$5.6

 
$(0.4)
 
—

 
 
 
 
 
 
 
 
For the Six Months Ended June 30,
 
 
 
 
 
 
 
Service Cost

$4.2

 

$5.0

 

$1.7

 

$2.0

Interest Cost
14.9

 
13.0

 
3.7

 
3.4

Expected Return on Plan Assets
(19.1
)
 
(17.6
)
 
(5.2
)
 
(4.9
)
Amortization of Prior Service Costs (Credits)
0.1

 
0.1

 
(1.2
)
 
(1.3
)
Amortization of Net Loss
7.1

 
10.7

 
0.2

 
0.8

Net Periodic Benefit Expense (Income)

$7.2

 

$11.2

 
$(0.8)
 
—