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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items]        
OGE's share of Enable Net Income $ 32.2 $ 18.5 $ 74.7  
Amortization of basis difference 3.4 0 7.0  
Elimination of Enogex Holdings fair value and other adjustments 3.7 0 5.5  
Equity in earnings of unconsolidated affiliates $ 39.3 $ 18.5 $ 87.2 $ 18.5