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Investment in Unconsolidated Affiliates Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]    
OGE's 28.5% share of Enable Net Income $ 42.5  
Amortization of basis difference 3.6  
Elimination of Enogex Holdings fair value and other adjustments 1.8  
Equity in earnings of unconsolidated affiliates $ 47.9 $ 0