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DERIVATIVE INSTRUMENTS - GAINS (LOSSES) AND NOTIONAL VOLUMES (Details) MWh in Millions, MMBTU in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 USD ($) MMBTU MWh | Jun. 30, 2022 USD ($) MWh MMBTU | Jun. 30, 2023 USD ($) MMBTU MWh | Jun. 30, 2022 USD ($) MWh MMBTU
Realized gains and losses |  |  |  |
Gains (losses) | $ (65.0) | $ 113.2 | $ (139.9) | $ 145.8
Natural gas contracts |  |  |  |
Realized gains and losses |  |  |  |
Gains (losses) | $ (69.1) | $ 108.9 | $ (144.4) | $ 140.5
Notional sales volumes |  |  |  |
Notional sales volumes | MMBTU | 47.7 | 41.1 | 106.4 | 100.6
FTRs and TCRs |  |  |  |
Realized gains and losses |  |  |  |
Gains (losses) | $ 4.1 | $ 4.3 | $ 4.5 | $ 5.3
Notional sales volumes |  |  |  |
Notional sales volumes | MWh | 7.5 | 7.0 | 14.8 | 14.0
Non-Utility Energy Infrastructure |  |  |  |
Realized gains and losses |  |  |  |
Realized gains and losses on derivatives income statement location | Total operating revenues | Total operating revenues | Total operating revenues | Total operating revenues
Utility operations |  |  |  |
Realized gains and losses |  |  |  |
Realized gains and losses on derivatives income statement location | Cost of sales | Cost of sales | Cost of sales | Cost of sales

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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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