AFFILIATED TRANSACTIONS - SCEG (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Affiliated Transaction [Line Items]
Proceeds from Equity Method Investment, Dividends or Distributions	$ 4.0	$ 7.8	$ 10.4
Equity Method Investments	4.1	5.7	5.2
Related Party Transaction, Expenses from Transactions with Related Party	300.0	292.2	285.6
Canadys Refined Coal LLC [Member]
Affiliated Transaction [Line Items]
Related Party Transaction Purchases from Related Party	233.2	260.3	134.2
Sales to Affiliate	$ 232.0	259.0	133.6
Equity Method Investment, Ownership Percentage	40.00%
Related Party Tax Expense, Due from Affiliates, Current	$ 12.8	27.8
Related Party Tax Expense, Due to Affiliates, Current	12.9	27.9
SCE&G
Affiliated Transaction [Line Items]
Due to Affiliate, Current	113.0	180.0
Due from Affiliate, Current	22.0	109.0
Related Party Transaction, Due from (to) Related Party, Current	9.0	80.0
Accounts Payable, Related Parties, Current	57.0	47.3
CGT [Member]
Affiliated Transaction [Line Items]
Related Party Transaction Purchases from Related Party	3.4	30.0	33.3
Due to Affiliate, Current		3.3
Due from Affiliate, Current		1.2
Retail Gas and Energy Marketing Segment [Member]
Affiliated Transaction [Line Items]
Due to Affiliate, Current	7.5	12.6
Cost of Natural Gas Purchases	$ 128.5	$ 195.7	$ 166.9

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Cost of natural gas purchased and associated transportation and storage costs during the period.

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Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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