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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
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)
2015
 
2014
 
2015
 
2014
Millions
 
 
 
 
 
 
 
Three months ended March 31,
 
 
 
 
 
 
 
Service Cost

$2.5

 

$2.1

 

$1.1

 

$0.9

Interest Cost
7.5

 
7.4

 
1.8

 
1.8

Expected Return on Plan Assets
(10.2
)
 
(9.6
)
 
(2.7
)
 
(2.6
)
Amortization of Prior Service Costs (Credits)
—

 
0.1

 
(0.8
)
 
(0.6
)
Amortization of Net Loss
4.5

 
3.6

 
0.1

 
0.1

Net Periodic Benefit Expense (Income)

$4.3

 

$3.6

 
$(0.5)
 
$(0.4)