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Segment Reporting (Tables)
 6 Months Ended
Jun. 30, 2020
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
NSP-Wisconsin's segment information for the three and six months ended June 30:
Three Months Ended June 30
(Millions of Dollars)20202019
Regulated Electric
Operating revenues (a)
$199.3  $207.9  
Intersegment revenues
0.1  0.1  
Total operating revenue
$199.4  $208.0  
Net income16.3  10.9  
Regulated Natural Gas
Operating revenues
$19.0  $20.9  
Intersegment revenues
0.2  —  
Total operating revenue
$19.2  $20.9  
Net loss(2.9) (1.3) 
All Other
Operating revenues
$0.2  $0.1  
Net loss(1.3) (1.0) 
Consolidated Total
Operating revenues (a)
$218.8  $229.0  
Reconciling eliminations
(0.3) (0.1) 
Total operating revenues
$218.5  $228.9  
Net income12.1  8.6  
(a) Operating revenues include $41.5 million and $43.5 million of affiliate electric revenue for the three months ended June 30, 2020 and 2019, respectively.
Six Months Ended June 30
(Millions of Dollars)20202019
Regulated Electric
Operating revenues (a)
$411.1  $422.9  
Intersegment revenues
0.2  0.2  
Total operating revenue
$411.3  $423.1  
Net income41.0  24.1  
Regulated Natural Gas
Operating revenues
$64.2  $82.0  
Intersegment revenues
0.3  0.2  
Total operating revenues
$64.5  $82.2  
Net income6.0  9.2  
All Other
Operating revenues
$0.2  $0.2  
Net loss(1.3) (0.7) 
Consolidated Total
Operating revenues (a)
$476.0  $505.5  
Reconciling eliminations
(0.5) (0.4) 
Total operating revenues
$475.5  $505.1  
Net income45.7  32.6  
(a) Operating revenues include $82.4 million and $87.6 million of affiliate electric revenue for the six months ended June 30, 2020 and 2019, respectively.
 [1]
[1] Operating revenues include $41.5 million and $43.5 million of affiliate electric revenue for the three months ended June 30, 2020 and 2019, respectively.