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Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current Income Tax Expense [Abstract]      
Federal [1] $ 0.0 $ 0.0 $ 0.0
State [1] 0.3 0.4 0.2
Total Current Income Tax Expense 0.3 0.4 0.2
Deferred Income Tax Expense [Abstract]      
Federal 12.1 12.0 19.4
Federal - Remeasurement of Deferred Income Taxes [2] (13.0) 0.0 0.0
State 15.8 8.1 6.5
Investment Tax Credit Amortization (0.5) (0.7) (0.8)
Total Deferred Income Tax Expense 14.4 19.4 25.1
Total Income Tax Expense $ 14.7 $ 19.8 $ 25.3
[1] For the years ended December 31, 2017, 2016 and 2015, the federal and state current tax expense was minimal due to NOLs which resulted from the bonus depreciation provisions of the Protecting Americans from Tax Hikes Act of 2015, the Tax Increase Prevention Act of 2014 and the American Taxpayer Relief Act of 2012. The federal and state NOLs will be carried forward to offset future taxable income.
[2] Deferred income tax benefit from the remeasurement of deferred income tax assets and liabilities resulting from the TCJA. (See Note 1. Operations and Significant Accounting Policies.)