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OPERATING REVENUES (Tables) - Utility
 12 Months Ended
Dec. 31, 2021
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 have different expectations of service, energy and demand requirements, and can be impacted differently by regulatory activities within their jurisdictions.
Year Ended December 31
(in millions)202120202019
Wisconsin Public Service Corporation
Electric utility$1,176.7 $1,136.9 $1,114.1 
Natural gas utility338.8 269.5 295.5 
Total revenues from contracts with customers1,515.5 1,406.4 1,409.6 
Other operating revenues5.4 0.7 2.3 
Total operating revenues$1,520.9 $1,407.1 $1,411.9 
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:
Year Ended December 31
(in millions)202120202019
Residential$423.5 $420.0 $369.4 
Small commercial and industrial376.2 353.6 355.9 
Large commercial and industrial256.6 220.0 223.3 
Other8.4 8.4 8.4 
Total retail revenues1,064.7 1,002.0 957.0 
Wholesale86.7 95.1 105.8 
Resale11.4 19.6 28.7 
Other utility revenues13.9 20.2 22.6 
Total electric utility operating revenues$1,176.7 $1,136.9 $1,114.1 
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:
Year Ended December 31
(in millions)202120202019
Residential$202.0 $156.4 $178.4 
Commercial and industrial122.0 83.9 105.9 
Total retail revenues324.0 240.3 284.3 
Transportation19.4 19.6 17.1 
Other utility revenues (1)
(4.6)9.6 (5.9)
Total natural gas utility operating revenues$338.8 $269.5 $295.5 

(1)    Includes the revenues subject to our purchased gas recovery mechanism. As these amounts are billed to customers, they are reflected in retail revenues with an offsetting decrease in other utility revenues.
Other operating revenues  
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
Other operating revenues consist of the following:
Year Ended December 31
(in millions)202120202019
Late payment charges (1)
$3.9 $2.0 $3.2 
Alternative revenues (2)
1.4 (1.4)(1.1)
Rental revenues0.1 0.1 0.2 
Total other operating revenues$5.4 $0.7 $2.3 

(1)    The increase in late payment charges during 2021, compared with 2020, was a result of the expiration of a regulatory order from the PSCW in response to the COVID-19 pandemic, which included the suspension of late payment charges during a designated time period. See Note 23, Regulatory Environment, for more information.

(2)    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, as discussed in Note 1(d), Operating Revenues.