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Benefit Plans and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
Components of Net Periodic Benefit Cost
 
 
Three Months Ended March 31
 
 
2020
 
2019
 
2020
 
2019
(Millions of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
1.2

 
$
1.1

 
$
—

 
$
—

Interest cost (a)
 
1.2

 
1.4

 
0.1

 
0.1

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

 
—

Amortization of prior service credit (a)
 
—

 
—

 
(0.1
)
 
(0.1
)
Amortization of net loss (a)
 
1.2

 
1.1

 
0.1

 
0.1

Net periodic benefit cost
 
1.5

 
1.5

 
0.1

 
0.1

Costs not recognized due to effects of regulation
 
1.8

 
0.2

 
—

 
—

Net benefit cost recognized for financial reporting
 
$
3.3

 
$
1.7

 
$
0.1

 
$
0.1


(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.