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INCOME TAXES (Tables)
3 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Schedule of effective income tax rate reconciliation
The provision for income taxes differs from the amount of income tax determined by applying the applicable United States statutory federal income tax rate to income before income taxes as a result of the following:
Three Months Ended March 31, 2024Three Months Ended March 31, 2023
(in millions)AmountEffective Tax RateAmountEffective Tax Rate
Statutory federal income tax$149.1 21.0 %$122.1 21.0 %
State income taxes net of federal tax benefit43.4 6.1 %35.8 6.2 %
PTCs, net(88.0)(12.4)%(66.2)(11.4)%
Federal excess deferred tax amortization(15.4)(2.2)%(13.1)(2.3)%
Other, net(1.4)(0.2)%(4.5)(0.8)%
Total income tax expense$87.7 12.3 %$74.1 12.7 %