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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items]        
OGE's share of Enable Net Income $ 36.4 $ 35.1 $ 111.1 $ 53.6
Amortization of basis difference 3.4 5.9 10.4 5.9
Elimination of Enogex Holdings fair value and other adjustments 4.9 5.0 10.4 5.0
Equity in earnings of unconsolidated affiliates $ 44.7 $ 46.0 $ 131.9 $ 64.5