Subsequent Event - Agreement and Plan of Merger (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Oct. 17, 2014 Subsequent Event [Member]	Oct. 17, 2014 Cleco Corporation [Member] Subsequent Event [Member]	Oct. 17, 2014 Como [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock, par value (in dollars per share)	$ 1	$ 1	$ 1.00
Merger Agreement Price, per Share			$ 55.37
Merger Agreement, Required Termination Fee				$ 120.0	$ 180.0
Merger Agreement, Termination of Agreement, Required Reimburse of Expenses				$ 18.0