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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2015
Pension and Other Postretirement Benefit Plans [Abstract]  
Components of Net Periodic Benefit Expense (Income) [Table Text Block]
 
Pension
 
Other
Postretirement
Components of Net Periodic Benefit Expense (Income)
2015
 
2014
 
2015
 
2014
Millions
 
 
 
 
 
 
 
Quarter Ended June 30,
 
 
 
 
 
 
 
Service Cost

$2.5

 

$2.1

 

$1.1

 

$0.8

Interest Cost
7.4

 
7.5

 
1.8

 
1.9

Expected Return on Plan Assets
(10.1
)
 
(9.5
)
 
(2.8
)
 
(2.6
)
Amortization of Prior Service Costs (Credits)
0.1

 
—

 
(0.7
)
 
(0.6
)
Amortization of Net Loss
4.5

 
3.5

 
0.1

 
0.1

Net Periodic Benefit Expense (Income)

$4.4

 

$3.6

 
$(0.5)
 
$(0.4)
 
 
 
 
 
 
 
 
Six Months Ended June 30,
 
 
 
 
 
 
 
Service Cost

$5.0

 

$4.2

 

$2.2

 

$1.7

Interest Cost
14.9

 
14.9

 
3.6

 
3.7

Expected Return on Plan Assets
(20.3
)
 
(19.1
)
 
(5.5
)
 
(5.2
)
Amortization of Prior Service Costs (Credits)
0.1

 
0.1

 
(1.5
)
 
(1.2
)
Amortization of Net Loss
9.0

 
7.1

 
0.2

 
0.2

Net Periodic Benefit Expense (Income)

$8.7

 

$7.2

 
$(1.0)
 
$(0.8)