EMPLOYEE BENEFIT PLANS (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Pension Benefits
Pension and Other Postretirement Benefit Plans
Service cost	$ 4.6	$ 4.8	$ 9.2	$ 9.5
Interest cost	11.1	11.9	22.2	23.7
Expected return on assets	(16.2)	(16.5)	(32.4)	(32.9)
Prior service cost amortization	1.8	1.8	3.6	3.7
Amortization of actuarial loss	3.0	4.3	6.0	8.6
Net periodic benefit cost	4.3	6.3	8.6	12.6
Other Postretirement Benefits
Pension and Other Postretirement Benefit Plans
Service cost	1.1	1.1	2.2	2.2
Interest cost	3.0	3.2	6.0	6.2
Prior service cost amortization	0.3	0.2	0.6	0.5
Transition obligation amortization	0.2	0.1	0.4	0.3
Amortization of actuarial loss	0.1	0.1	0.2	0.2
Net periodic benefit cost	4.7	4.7	9.4	9.4
SCE&G
Pension and Other Postretirement Benefit Plans
Pension costs allowable to be deferred as regulatory assets related to retail electric operations and natural gas operations	$ 2.3	$ 5.4	$ 4.6	$ 10.7