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Income Tax Expense - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred Income Tax Assets [Abstract]    
Employee Benefits and Compensation $ 44.5 $ 67.6
Property Related 54.8 61.4
NOL Carryforwards 67.5 60.7
Tax Credit Carryforwards 509.1 455.7
Power Sales Agreements 16.5 20.1
Regulatory Liabilities 101.5 107.7
Other 0.0 22.4
Gross Deferred Income Tax Assets 793.9 795.6
Deferred Income Tax Asset Valuation Allowance (69.0) (69.9)
Total Deferred Income Tax Assets 724.9 725.7
Deferred Income Tax Liabilities [Abstract]    
Property-Related 680.8 691.5
Regulatory Assets for Benefit Obligations 54.9 71.5
Unamortized Investment Tax Credits 30.5 31.1
Partnership Basis Differences 106.3 86.7
Regulatory Assets 30.0 32.6
Other 8.1 8.0
Total Deferred Income Tax Liabilities 910.6 921.4
Net Deferred Income Taxes [1] $ 185.7 $ 195.7
[1] Recorded as a net long-term Deferred Income Tax liability on the Consolidated Balance Sheet.