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RELATED PARTIES - OTHER TRANSACTIONS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
ATC      
Related parties      
Charges to related party for services and other items $ 8.0 $ 11.9 $ 11.0
Charges from related party for services and other items 107.0 107.4 107.8
Net refund from ATC related to FERC ROE orders 2.3 3.3 0.0
WRPC      
Related parties      
Charges to related party for services and other items 0.6 1.2 0.8
Charges from related party for services and other items 2.4 2.6 2.5
Rental payments to WRPC $ 1.9 1.9 1.9
Percentage of energy generated that we receive 50.00%    
WE      
Related parties      
Charges to related party for services and other items $ 9.4 8.3 9.3
Charges from related party for services and other items 11.8 12.5 13.2
WE | Natural gas      
Related parties      
Sales to related party 2.9 1.5 2.0
UMERC      
Related parties      
Charges to related party for services and other items 3.1 4.4 4.2
UMERC | Natural gas      
Related parties      
Sales to related party 2.6 2.0 2.8
UMERC | Electric      
Related parties      
Sales to related party 0.0 0.0 4.5
Bluewater      
Related parties      
Charges from related party for services and other items 10.3 10.6 11.2
Bluewater | Natural gas      
Related parties      
Sales to related party 1.9 1.9 1.1
WBS      
Related parties      
Charges to related party for services and other items 15.4 22.2 32.5
Charges from related party for services and other items 67.4 $ 69.0 $ 87.0
Payments for transfer of certain software assets from WBS $ 5.4