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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 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 September 30,
 
 
 
 
 
 
 
Service Cost
$2.6

 

$2.0

 
$1.0

 

$0.9

Interest Cost
7.5

 
7.5

 
1.8

 
1.8

Expected Return on Plan Assets
(10.2
)
 
(9.6
)
 
(2.7
)
 
(2.5
)
Amortization of Prior Service Costs (Credits)
—

 
0.1

 
(0.7
)
 
(0.7
)
Amortization of Net Loss
4.4

 
3.6

 
0.1

 
0.1

Net Periodic Benefit Expense (Income)

$4.3

 

$3.6

 
$(0.5)
 
$(0.4)
 
 
 
 
 
 
 
 
Nine Months Ended September 30,
 
 
 
 
 
 
 
Service Cost
$7.6

 

$6.2

 
$3.2

 

$2.6

Interest Cost
22.4

 
22.4

 
5.4

 
5.5

Expected Return on Plan Assets
(30.5
)
 
(28.7
)
 
(8.2
)
 
(7.7
)
Amortization of Prior Service Costs (Credits)
0.1

 
0.2

 
(2.2
)
 
(1.9
)
Amortization of Net Loss
13.4

 
10.7

 
0.3

 
0.3

Net Periodic Benefit Expense (Income)

$13.0

 

$10.8

 
$(1.5)
 
$(1.2)