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

$2.0

 

$2.6

 

$1.0

 

$1.0

Interest Cost
8.2

 
7.5

 
1.9

 
1.8

Expected Return on Plan Assets
(10.7
)
 
(10.2
)
 
(2.8
)
 
(2.7
)
Amortization of Prior Service Credits
—

 
—

 
(0.7
)
 
(0.7
)
Amortization of Net Loss
2.4

 
4.4

 
—

 
0.1

Net Periodic Benefit Expense (Income)

$1.9

 

$4.3

 
$(0.6)
 
$(0.5)
 
 
 
 
 
 
 
 
Nine Months Ended September 30,
 
 
 
 
 
 
 
Service Cost

$6.1

 

$7.6

 

$3.0

 

$3.2

Interest Cost
24.4

 
22.4

 
5.6

 
5.4

Expected Return on Plan Assets
(32.0
)
 
(30.5
)
 
(8.4
)
 
(8.2
)
Amortization of Prior Service Costs (Credits)
—

 
0.1

 
(2.2
)
 
(2.2
)
Amortization of Net Loss
7.3

 
13.4

 
0.1

 
0.3

Net Periodic Benefit Expense (Income)

$5.8

 

$13.0

 
$(1.9)
 
$(1.5)