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Benefit Plans and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Benefit Plans and Other Postretirement Benefits
Benefit Plans and Other Postretirement Benefits
Components of Net Periodic Benefit Cost
 
 
Three Months Ended March 31
 
 
2019

2018

2019

2018
(Millions of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
1.1

 
$
1.2

 
$
—

 
$
—

Interest cost (a)
 
1.4

 
1.4

 
0.1

 
0.2

Expected return on plan assets (a)
 
(2.1
)
 
(2.3
)
 
—

 
—

Amortization of prior service (credit) cost (a)
 
—

 
—

 
(0.1
)
 
(0.1
)
Amortization of net loss (a)
 
1.1

 
1.4

 
0.1

 
0.1

Settlement charge
 
—

 
—

 
—

 
—

Net periodic benefit cost
 
1.5

 
1.7

 
0.1

 
0.2

Costs not recognized due to the effects of regulation
 
0.2

 
0.2

 
—

 
—

Net benefit cost recognized for financial reporting
 
$
1.7

 
$
1.9

 
$
0.1

 
$
0.2

(a) 
The components of net periodic cost other than the service cost component are included in the line item “other expense, net” in the consolidated statement of income or capitalized on the consolidated balance sheet as a regulatory asset.
In January 2019, contributions of $150 million were made across four of Xcel Energy’s pension plans, of which $7 million was attributable to NSP-Wisconsin. Xcel Energy does not expect additional pension contributions during 2019.