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DERIVATIVE FINANCIAL INSTRUMENTS On Income Statement (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivative [Line Items]    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax $ (5.0) $ (3.0)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax $ (7.0) $ (9.0)
Interest Rate Cash Flow Hedge Ineffectiveness is Immaterial insignificant insignificant
Commodity Contract    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 5.0 $ 7.0
Commodity Contract | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (2.0) (1.0)
Interest Rate Contract [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 2.0 2.0
Interest Rate Contract [Member] | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (3.0) (2.0)
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Deferred in Regulatory Accounts Effective Portion, Net (144.0) (94.0)
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Deferred in Regulatory Accounts Effective Portion, Net (3.0) (2.0)
Other Nonoperating Income (Expense) [Member] | Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income 0.0 4.0
Gas Purchased for Resale [Member] [Member] | Commodity Contract    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred 1.1  
Gas Purchased for Resale [Member] [Member] | Commodity Contract | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (5.0) (7.0)
Interest Expense [Member] | Interest Rate Contract [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred 6.5  
Interest Expense [Member] | Interest Rate Contract [Member] | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (2.0) (2.0)
Interest Expense [Member] | Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Regulatory Accounts into Income, Estimated Net Amount to be Transferrred 0.7  
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income (1.0) $ 0.0
Interest Expense [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Regulatory Accounts into Income, Estimated Net Amount to be Transferrred $ 2.1  
SCEG    
Derivative [Line Items]    
Interest Rate Cash Flow Hedge Ineffectiveness is Immaterial insignificant insignificant
SCEG | Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Deferred in Regulatory Accounts Effective Portion, Net $ (144.0) $ (94.0)
SCEG | Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Deferred in Regulatory Accounts Effective Portion, Net (3.0) (2.0)
SCEG | Other Nonoperating Income (Expense) [Member] | Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income 0.0 4.0
SCEG | Interest Expense [Member] | Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Regulatory Accounts into Income, Estimated Net Amount to be Transferrred 0.7  
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income (1.0) $ 0.0
SCEG | Interest Expense [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Regulatory Accounts into Income, Estimated Net Amount to be Transferrred $ 2.1