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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Expense (Income) [Table Text Block]
 
Pension
 
Other
Postretirement
Components of Net Periodic Benefit Expense (Income)
2016
 
2015
 
2016
 
2015
Millions
 
 
 
 
 
 
 
Quarter Ended June 30,
 
 
 
 
 
 
 
Service Cost

$2.1

 

$2.5

 

$1.0

 

$1.1

Interest Cost
8.1

 
7.4

 
1.8

 
1.8

Expected Return on Plan Assets
(10.7
)
 
(10.1
)
 
(2.8
)
 
(2.8
)
Amortization of Prior Service Costs (Credits)
—

 
0.1

 
(0.8
)
 
(0.7
)
Amortization of Net Loss
2.5

 
4.5

 
0.1

 
0.1

Net Periodic Benefit Expense (Income)

$2.0

 

$4.4

 
$(0.7)
 
$(0.5)
 
 
 
 
 
 
 
 
Six Months Ended June 30,
 
 
 
 
 
 
 
Service Cost

$4.1

 

$5.0

 

$2.0

 

$2.2

Interest Cost
16.2

 
14.9

 
3.7

 
3.6

Expected Return on Plan Assets
(21.3
)
 
(20.3
)
 
(5.6
)
 
(5.5
)
Amortization of Prior Service Costs (Credits)
—

 
0.1

 
(1.5
)
 
(1.5
)
Amortization of Net Loss
4.9

 
9.0

 
0.1

 
0.2

Net Periodic Benefit Expense (Income)

$3.9

 

$8.7

 
$(1.3)
 
$(1.0)