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OPERATING REVENUES (Tables) - Utility segment
 6 Months Ended
Jun. 30, 2024
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
The following tables present our operating revenues disaggregated by revenue source for our utility segment. We do not have any revenues associated with our other segment. We disaggregate revenues into categories that depict how the nature, amount, timing, and uncertainty of revenues and cash flows are affected by economic factors. Revenues are further disaggregated by electric and natural gas operations and then by customer class. Each customer class within our electric and natural gas operations has different expectations of service, energy and demand requirements, and can be impacted differently by regulatory activities within their jurisdictions.
Three Months Ended June 30Six Months Ended June 30
(in millions)2024202320242023
Wisconsin Public Service Corporation
Electric utility$286.8 $319.8 $587.1 $639.8 
Natural gas utility51.3 61.5 177.0 231.4 
Total revenues from contracts with customers338.1 381.3 764.1 871.2 
Other operating revenues(1.1)(0.3)0.1 1.3 
Total operating revenues$337.0 $381.0 $764.2 $872.5 
Revenues from contracts with customers | Electric  
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
The following table disaggregates electric utility operating revenues into customer class:
Three Months Ended June 30Six Months Ended June 30
(in millions)2024202320242023
Residential$103.8 $113.6 $218.2 $234.4 
Small commercial and industrial98.4 109.1 198.0 213.7 
Large commercial and industrial60.7 67.9 119.4 132.8 
Other2.1 2.2 4.3 4.4 
Total retail revenues265.0 292.8 539.9 585.3 
Wholesale14.0 20.1 28.6 42.6 
Resale4.6 4.3 12.6 10.3 
Other utility revenues3.2 2.6 6.0 1.6 
Total electric utility operating revenues$286.8 $319.8 $587.1 $639.8 
Revenues from contracts with customers | Natural gas  
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
The following table disaggregates natural gas utility operating revenues into customer class:
Three Months Ended June 30Six Months Ended June 30
(in millions)2024202320242023
Residential$31.3 $29.7 $107.2 $146.7 
Commercial and industrial15.2 14.0 57.4 84.8 
Total retail revenues46.5 43.7 164.6 231.5 
Transportation5.0 4.9 11.8 11.8 
Other utility revenues (1)
(0.2)12.9 0.6 (11.9)
Total natural gas utility operating revenues$51.3 $61.5 $177.0 $231.4 

(1)Includes the revenues subject to our purchased gas recovery mechanism, which fluctuate based on actual natural gas costs incurred, compared with the recovery of natural gas costs that were anticipated in rates.
Other operating revenues  
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
Other operating revenues consist primarily of the following:
Three Months Ended June 30Six Months Ended June 30
(in millions)2024202320242023
Late payment charges$0.8 $1.1 $1.9 $2.3 
Rental revenues0.1 0.1 0.2 0.2 
Alternative revenues (1)
(2.0)(1.5)(2.0)(1.2)
Total other operating revenues$(1.1)$(0.3)$0.1 $1.3 

(1)Negative amounts can result from alternative revenues being reversed to revenues from contracts with customers as the customer is billed for these alternative revenues. Negative amounts can also result from revenues to be refunded to wholesale customers subject to true-ups. For more information about our alternative revenues, see Note 1(d), Operating Revenues, in our 2023 Annual Report on Form 10-K.