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

$2.0

 

$2.4

 

$0.9

 

$0.9

Interest Cost
7.5

 
6.5

 
1.8

 
1.7

Expected Return on Plan Assets
(9.6
)
 
(8.8
)
 
(2.5
)
 
(2.4
)
Amortization of Prior Service Costs (Credits)
0.1

 
0.1

 
(0.7
)
 
(0.6
)
Amortization of Net Loss
3.6

 
5.4

 
0.1

 
0.4

Net Periodic Benefit Expense (Income)

$3.6

 

$5.6

 
$(0.4)
 
—

 
 
 
 
 
 
 
 
For the Nine Months Ended September 30,
 
 
 
 
 
 
 
Service Cost

$6.2

 

$7.4

 

$2.6

 

$2.9

Interest Cost
22.4

 
19.5

 
5.5

 
5.1

Expected Return on Plan Assets
(28.7
)
 
(26.4
)
 
(7.7
)
 
(7.3
)
Amortization of Prior Service Costs (Credits)
0.2

 
0.2

 
(1.9
)
 
(1.9
)
Amortization of Net Loss
10.7

 
16.1

 
0.3

 
1.2

Net Periodic Benefit Expense (Income)

$10.8

 

$16.8

 
$(1.2)
 
—