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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Expense (Income) [Table Text Block]
 
Pension
 
Other
Postretirement
Components of Net Periodic Benefit Cost
2018
 
2017
 
2018
 
2017
Millions
 
 
 
 
 
 
 
Quarter Ended June 30,
 
 
 
 
 
 
 
Service Cost

$2.8

 

$2.6

 

$1.3

 

$1.1

Non-Service Cost Components (a)
 
 
 
 
 
 
 
Interest Cost
7.4

 
8.2

 
1.8

 
1.9

Expected Return on Plan Assets
(11.1
)
 
(10.6
)
 
(2.8
)
 
(2.7
)
Amortization of Prior Service Credits
—

 
—

 
(0.5
)
 
(0.5
)
Amortization of Net Loss
3.0

 
2.4

 
0.2

 
0.1

Net Periodic Benefit Cost (Income)

$2.1

 

$2.6

 
—

 
$(0.1)
 
 
 
 
 
 
 
 
Six Months Ended June 30,
 
 
 
 
 
 
 
Service Cost

$5.5

 

$5.1

 

$2.5

 

$2.2

Non-Service Cost Components (a)
 
 
 
 
 
 
 
Interest Cost
14.8

 
16.3

 
3.6

 
3.8

Expected Return on Plan Assets
(22.1
)
 
(21.2
)
 
(5.5
)
 
(5.3
)
Amortization of Prior Service Credits
—

 
—

 
(0.9
)
 
(1.0
)
Amortization of Net Loss
6.0

 
4.9

 
0.4

 
0.2

Net Periodic Benefit Cost (Income)

$4.2

 

$5.1

 

$0.1

 
$(0.1)

(a)
These components of net periodic benefit cost are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.