EMPLOYEE BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension and Other Postretirement Benefit Plans
Pension Contributions			No
Components of Net Periodic Benefit Cost
Defined Benefit Plan, Curtailments	$ 9.9		$ 9.9
Pension curtailment deferred in reg asset	6.3
Increase (Decrease) in Pension Plan Obligations	128
Pension Benefits
Components of Net Periodic Benefit Cost
Service cost	5.1	5.0	16.9	14.7
Interest cost	9.5	10.9	28.4	32.2
Expected return on assets	(15.1)	(15.0)	(45.8)	(44.6)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax	1.5	1.8	4.9	5.3
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	0	0	0	0
Defined Benefit Plan, Actuarial Net (Gains) Losses	3.5	4.5	14.4	13.8
Defined Benefit Plan, Net Periodic Benefit Cost	14.4	7.2	28.7	21.4
Other Postretirement Benefits
Components of Net Periodic Benefit Cost
Service cost	1.2	1.1	4.4	3.6
Interest cost	2.8	2.9	8.3	8.9
Expected return on assets	0	0	0	0
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax	0.1	0.2	0.5	0.7
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	0	0.2	0.3	0.5
Defined Benefit Plan, Actuarial Net (Gains) Losses	0.8	0	2.5	0.4
Defined Benefit Plan, Net Periodic Benefit Cost	4.9	4.4	16.0	14.1
SCEG
Components of Net Periodic Benefit Cost
Defined Benefit Plan, Curtailments	8.4		8.4
Pension Costs Related to Retail Electric Operations and Natural Gas Operations Deferred as Regulatory Assets	1.2	4.0	2.4	11.4
Pension curtailment deferred in reg asset	5.4
Increase (Decrease) in Pension Plan Obligations	108
SCEG | Pension Benefits
Components of Net Periodic Benefit Cost
Service cost	4.1	4.1	13.7	11.8
Interest cost	8.0	9.1	24.0	27.3
Expected return on assets	(12.7)	(12.6)	(38.7)	(37.8)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax	1.3	1.6	4.1	4.5
Defined Benefit Plan, Actuarial Net (Gains) Losses	3.0	3.7	12.2	11.7
Defined Benefit Plan, Net Periodic Benefit Cost	12.1	5.9	23.7	17.5
SCEG | Other Postretirement Benefits
Components of Net Periodic Benefit Cost
Service cost	1.0	0.8	3.5	2.8
Interest cost	2.1	2.3	6.5	7.0
Expected return on assets	0	0	0	0
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax	0.1	0.1	0.4	0.5
Defined Benefit Plan, Actuarial Net (Gains) Losses	0.7	0.1	2.0	0.3
Defined Benefit Plan, Net Periodic Benefit Cost	$ 3.9	$ 3.3	$ 12.4	$ 10.6