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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Expense (Income) [Table Text Block]
 
Pension
 
Other
Postretirement
Components of Net Periodic Benefit Cost (Credit)
2020
 
2019
 
2020
 
2019
Millions
 
 
 
 
 
 
 
Three Months Ended March 31,
 
 
 
 
 
 
 
Service Cost

$2.6

 

$2.3

 

$0.8

 

$1.0

Non-Service Cost Components (a)
 
 
 
 
 
 
 
Interest Cost
7.0

 
8.0

 
1.3

 
1.9

Expected Return on Plan Assets
(10.7
)
 
(11.0
)
 
(2.5
)
 
(2.6
)
Amortization of Prior Service Credits
—

 
—

 
(2.0
)
 
(0.4
)
Amortization of Net Loss
3.2

 
1.8

 
0.3

 
0.1

Net Periodic Benefit Cost (Credit)

$2.1

 

$1.1

 
$(2.1)
 
—


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