AFFILIATED TRANSACTIONS - SCEG AFFILIATED TRANSACTIONS -SCEG (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Affiliated Transaction [Line Items]
Proceeds from Equity Method Investment, Dividends or Distributions	$ 7.8	$ 10.4	$ 12.5
Equity Method Investments	5.7us-gaap_EquityMethodInvestments	5.2us-gaap_EquityMethodInvestments	10.6us-gaap_EquityMethodInvestments
Related Party Transaction, Expenses from Transactions with Related Party	292.2	285.6	305.6
Canadys Refined Coal LLC [Member]
Affiliated Transaction [Line Items]
Related Party Transaction Purchases from Related Party	260.3	134.2
Sales to Affiliate	259.0	133.6
Equity Method Investment, Ownership Percentage	40.00%
Related Party Tax Expense, Due from Affiliates, Current	27.8	18.0
Related Party Tax Expense, Due to Affiliates, Current	27.9	18.0
SCE&G
Affiliated Transaction [Line Items]
Due to Affiliate, Current	180.0	117.0
Due from Affiliate, Current	109.0	19.0
Related Party Transaction, Due from (to) Related Party, Current	80
Accounts Payable, Related Parties, Current	47.3	49.1
CGT [Member]
Affiliated Transaction [Line Items]
due from affiliate			insignificant
Related Party Transaction Purchases from Related Party	30.0	33.3	35.9
Due to Affiliate, Current	3.3	3.3
Due from Affiliate, Current	1.2	1.3
Retail Gas and Energy Marketing Segment [Member]
Affiliated Transaction [Line Items]
Due to Affiliate, Current	12.6	12.5
Cost of Natural Gas Purchases	$ 195.7	$ 166.9	$ 125.5

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Sales to Affiliate

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

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Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

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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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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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