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Income Tax Expense - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Deferred Income Tax Assets    
Employee Benefits and Compensation $ 29.3 $ 46.4
Property-Related 58.1 61.9
NOL Carryforwards 13.0 16.7
Capital Loss Carryforwards 2.1 13.1
Tax Credit Carryforwards 557.4 548.7
Power Sales Agreements 9.0 13.7
Regulatory Liabilities 89.0 95.5
Other 8.7 28.1
Gross Deferred Income Tax Assets 766.6 824.1
Deferred Income Tax Asset Valuation Allowance (58.0) (60.2)
Total Deferred Income Tax Assets 708.6 763.9
Deferred Income Tax Liabilities    
Deferred Gain 7.9 7.9
Property-Related 632.0 661.7
Regulatory Asset for Benefit Obligations 48.1 57.7
Unamortized Investment Tax Credits 29.6 30.0
Partnership Basis Differences 156.5 126.0
Fuel Adjustment Clause 1.9 10.7
Regulatory Assets 25.3 28.0
Total Deferred Income Tax Liabilities 901.3 922.0
Net Deferred Income Taxes $ 192.7 $ 158.1