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INCOME TAX EXPENSE (Tables)
 6 Months Ended
Jun. 30, 2024
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Expense
Quarter EndedSix Months Ended
June 30,June 30,
 2024202320242023
Millions    
Current Income Tax Expense    
Federal (a)
$3.3$3.0$6.8$8.6
State3.23.26.65.4
Total Current Income Tax Expense$6.5$6.2$13.4$14.0
Deferred Income Tax Expense (Benefit)    
Federal (b)
$(5.0)$(7.8)$(10.0)$(16.1)
State0.1 1.3 2.5 3.4 
Investment Tax Credit Amortization(0.2)(0.1)(0.5)(0.2)
Total Deferred Income Tax Benefit$(5.1)$(6.6)$(8.0)$(12.9)
Total Income Tax Expense (Benefit)$1.4$(0.4)$5.4$1.1
(a)For the six months ended June 30, 2024 and 2023, the federal current tax expense is partially offset by production tax credits.
(b)For the six months ended June 30, 2024 and 2023, the federal deferred income tax benefit is primarily due to production tax credits.
Schedule of Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense In each quarter, the Company updates its estimate of the annual effective tax rate and if the estimated annual effective tax rate changes, the Company would make a cumulative adjustment in that quarter.
Quarter EndedSix Months Ended
Reconciliation of Taxes from Federal StatutoryJune 30,June 30,
Rate to Total Income Tax Expense2024202320242023
Millions  
Income Before Income Taxes$21.1 $40.3 $62.1 $79.4 
Statutory Federal Income Tax Rate21 %21 %21 %21 %
Income Taxes Computed at Statutory Federal Rate$4.4 $8.5 $13.0 $16.7 
Increase (Decrease) in Income Tax Due to:
State Income Taxes – Net of Federal Income Tax Benefit2.5 3.6 7.1 7.0 
Production Tax Credits (a)
(5.1)(10.2)(16.7)(20.6)
Investment Tax Credits (a)
(0.9)(1.4)(1.2)(3.6)
Regulatory Differences – Excess Deferred Tax(2.2)(2.4)(5.7)(5.2)
Non-Controlling Interest in Subsidiaries2.4 2.1 5.2 5.9 
AFUDC – Equity(0.3)— (0.9)— 
Transaction Costs3.3 — 3.3 — 
Other(2.7)(0.6)1.3 0.9 
Total Income Tax Expense (Benefit)$1.4 $(0.4)$5.4 $1.1 
(a)For the six months ended June 30, 2024 and 2023, the credits are presented net of any estimated discount on the sale of certain credits.