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Income Tax Expense (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal $ 1.1us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit
State 2.9us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0.1us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0.5us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total Current Tax Expense 4.0us-gaap_CurrentIncomeTaxExpenseBenefit 0.1us-gaap_CurrentIncomeTaxExpenseBenefit 0.5us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal 25.3us-gaap_DeferredFederalIncomeTaxExpenseBenefit 22.9us-gaap_DeferredFederalIncomeTaxExpenseBenefit 37.0us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 8.2us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 6.5us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1.4us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Investment Tax Credit Amortization (0.8)us-gaap_DeferredOtherTaxExpenseBenefit (0.8)us-gaap_DeferredOtherTaxExpenseBenefit (0.9)us-gaap_DeferredOtherTaxExpenseBenefit
Total Deferred Tax Expense 32.7us-gaap_DeferredIncomeTaxExpenseBenefit 28.6us-gaap_DeferredIncomeTaxExpenseBenefit 37.5us-gaap_DeferredIncomeTaxExpenseBenefit
Total Income Tax Expense $ 36.7us-gaap_IncomeTaxExpenseBenefit $ 28.7us-gaap_IncomeTaxExpenseBenefit $ 38.0us-gaap_IncomeTaxExpenseBenefit