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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) $ 63.3us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 47.7us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accumulated depreciation $ 3,343.1us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 3,221.0us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Common stock, par value (in dollars per share) $ 1us-gaap_CommonStockParOrStatedValuePerShare  
Common stock, shares authorized 200,000,000us-gaap_CommonStockSharesAuthorized  
Common stock, shares issued 79,963,091us-gaap_CommonStockSharesIssued 79,919,176us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 79,534,171us-gaap_CommonStockSharesOutstanding 79,445,380us-gaap_CommonStockSharesOutstanding
Preferred stock of subsidiary, par value (in dollars per share) $ 100us-gaap_PreferredStockParOrStatedValuePerShare  
Preferred stock of subsidiary, shares authorized 1,000,000us-gaap_PreferredStockSharesAuthorized  
Preferred stock of subsidiary, shares issued 511,882us-gaap_PreferredStockSharesIssued  
Preferred stock of subsidiary, shares outstanding 510,495us-gaap_PreferredStockSharesOutstanding