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Income Tax Expense (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Current Tax Expense (Benefit) [Abstract]          
Federal $ 0 [1] $ (0.2) [1] $ 0 [1] $ 0 [1]  
State 0.1 [1] 0 [1] 0.1 [1] 0 [1]  
Total Current Tax Expense (Benefit) 0.1 (0.2) 0.1 0  
Deferred Tax Expense (Benefit) [Abstract]          
Federal 2.9 3.6 9.2 8.2  
State 2.0 0.9 4.7 3.8  
Investment Tax Credit Amortization (0.1) (0.2) (0.3) (0.4)  
Total Deferred Tax Expense 4.8 4.3 13.6 11.6  
Total Income Tax Expense 4.9 4.1 13.7 11.6  
Effective Income Tax Rate     21.30% 20.00%  
Federal Statutory Income Tax Rate     41.00%    
Uncertain Tax Positions [Abstract]          
Gross Unrecognized Tax Benefits 1.2   1.2   1.2
Unrecognized Tax Benefits that Would Favorably Impact Effective Tax Rate $ 0.2   $ 0.2    
[1] For the quarter and six months ended June 30, 2014, the federal and state current tax expense reflected the utilization of NOL carryforwards from prior periods. The federal and state NOLs remaining after utilization in 2014 will be carried forward to offset future taxable income. For the quarter and six months ended June 30, 2013, the federal and state current tax benefit was due to federal and state NOLs which resulted from the bonus depreciation provision of the American Taxpayer Relief Act of 2012.