AFFILIATED TRANSACTIONS - SCEG AFFILIATED TRANSACTIONS -SCEG (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Canadys Refined Coal LLC [Member]
Related Party Transaction [Line Items]
Related Party Transaction Purchases from Related Party	$ 39.2	$ 14.3
Related Party Transaction, Amounts of Transaction	39.0	14.3
Due to Affiliate, Current	4.4		18.0
Due from Affiliate, Current	4.4		18.0
Equity Method Investment, Ownership Percentage	40.00%
CGT [Member]
Related Party Transaction [Line Items]
Related Party Transaction Purchases from Related Party	5.5	8.4
Due to Affiliate, Current	3.3		3.3
Due from Affiliate, Current	2.5		1.3
Energy Marketing [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current	17.2		12.5
Cost of Natural Gas Purchases	53.4	42.1
SCANA Services [Member]
Related Party Transaction [Line Items]
Related Party Transaction Purchases from Related Party	45.6		49.1
Related Party Transaction, Expenses from Transactions with Related Party	$ 76.2	$ 78.6