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Income Tax Expense - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred Income Tax Assets [Abstract]    
Employee Benefits and Compensation $ 65.9 $ 104.6
Property Related 104.3 110.5
NOL Carryforwards 99.1 185.6
Tax Credit Carryforwards 294.3 227.4
Power Sales Agreements 35.0 59.3
Regulatory Liabilities 117.7 7.3
Other 33.3 46.9
Gross Deferred Income Tax Assets 749.6 741.6
Deferred Income Tax Asset Valuation Allowance (60.0) (43.0)
Total Deferred Income Tax Assets 689.6 698.6
Deferred Income Tax Liabilities [Abstract]    
Property Related 758.3 1,039.6
Regulatory Assets for Benefit Obligations 61.4 91.9
Unamortized Investment Tax Credits 32.8 33.3
Partnership Basis Differences 34.9 50.9
Regulatory Assets 32.0 25.6
Other 0.7 11.9
Total Deferred Income Tax Liabilities 920.1 1,253.2
Net Deferred Income Taxes [1] $ 230.5 $ 554.6
[1] Recorded as a net long-term Deferred Income Tax liability on the Consolidated Balance Sheet. Additionally, see Note 1. Operations and Significant Accounting Policies – Revision of Prior Balance Sheet.