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Benefit Plans and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Benefit Plans and Other Postretirement Benefits
Components of Net Periodic Benefit Cost (Credit)
 
 
Three Months Ended March 31
 
 
2020
 
2019
 
2020
 
2019
(Millions of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
7.6

 
$
6.4

 
$
0.1

 
$
0.1

Interest cost (a)
 
11.4

 
12.9

 
3.2

 
3.9

Expected return on plan assets (a)
 
(17.6
)
 
(17.1
)
 
(4.4
)
 
(4.7
)
Amortization of prior service credit (a)
 
(0.7
)
 
(0.8
)
 
(1.0
)
 
(1.4
)
Amortization of net loss (a)
 
7.5

 
6.3

 
0.4

 
0.7

Net periodic benefit cost (credit)
 
8.2

 
7.7

 
(1.7
)
 
(1.4
)
Credits not recognized due to effects of regulation
 
0.6

 
1.9

 
0.6

 
0.3

Net benefit cost (credit) recognized for financial reporting
 
$
8.8

 
$
9.6

 
$
(1.1
)
 
$
(1.1
)

(a)  
The components of net periodic cost other than the service cost component are included in the line item “other (expense) income, net” in the consolidated statement of income or capitalized on the consolidated balance sheet as a regulatory asset.
In January 2020, contributions of $150.0 million were made across four of Xcel Energy’s pension plans, of which $50.0 million was attributable to PSCo. Xcel Energy does not expect additional pension contributions during 2020.