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Income Tax Expense (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Current Tax Expense (Benefit) [Abstract]          
Federal $ 0 [1],[2] $ 0 [1],[2] $ 0 [1],[2] $ 0 [1],[2]  
State 1.8 [1],[3] (0.1) [1],[3] 1.9 [1],[3] (0.1) [1],[3]  
Total Current Tax Expense (Benefit) 1.8 (0.1) 1.9 (0.1)  
Deferred Tax Expense (Benefit) [Abstract]          
Federal 11.2 7.3 20.4 15.5  
State 0.7 1.7 5.4 5.5  
Investment Tax Credit Amortization (0.3) (0.2) (0.6) (0.6)  
Total Deferred Tax Expense 11.6 8.8 25.2 20.4  
Total Income Tax Expense 13.4 8.7 27.1 20.3  
Effective Income Tax Rate     22.70% 22.10%  
Federal Statutory Income Tax Rate     41.00%    
Uncertain Tax Positions [Abstract]          
Gross Unrecognized Tax Benefits 2.0   2.0   1.2
Unrecognized Tax Benefits that Would Favorably Impact Effective Tax Rate $ 0.3   $ 0.3    
[1] For the quarter and nine months ended September 30, 2013, the 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.
[2] For the quarter and nine months ended September 30, 2014, the federal current tax expense of zero reflected the utilization of NOL carryforwards from prior periods. The federal NOLs remaining after utilization in 2014 will be carried forward to offset future taxable income.
[3] For the quarter and nine months ended September 30, 2014, the state current tax expense reflected initiatives implemented on the 2013 federal and state tax returns to utilize tax carryforwards that may have expired due to NOL carryforwards from prior periods. State NOL and alternative minimum tax carryforwards remaining after utilization in 2014 will be carried forward to offset future income.