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Pension and Other Postretirement Benefit Plans
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefit Plans [Text Block] PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS
 
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.

Employer Contributions. For the three months ended March 31, 2020, we contributed $10.7 million in cash to the defined benefit pension plans ($10.4 million for the three months ended March 31, 2019); we do not expect to make additional contributions to our defined benefit pension plans in 2020. For the three months ended March 31, 2020, and 2019, we made no contributions to our other postretirement benefit plans; we do not expect to make any contributions to our other postretirement benefit plans in 2020.