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CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Accounts receivable and accrued unbilled revenues, reserves (in dollars) $ 3.2us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2.5us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Property, plant, and equipment, accumulated depreciation (in dollars) $ 1,542.5us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 1,483.1us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Preferred stock, par value (in dollars per share) $ 100us-gaap_PreferredStockParOrStatedValuePerShare  
Preferred stock, shares authorized 1,000,000us-gaap_PreferredStockSharesAuthorized  
Preferred stock, shares issued 511,882us-gaap_PreferredStockSharesIssued  
Preferred stock, shares outstanding 511,882us-gaap_PreferredStockSharesOutstanding 511,882us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share) $ 4us-gaap_CommonStockParOrStatedValuePerShare  
Common stock, shares authorized 32,000,000us-gaap_CommonStockSharesAuthorized  
Common stock, shares issued 23,896,962us-gaap_CommonStockSharesIssued  
Common stock, shares outstanding 23,896,962us-gaap_CommonStockSharesOutstanding