Acquisitions (Details) (Southern Power [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	6 Months Ended
	May 22, 2014	Jun. 30, 2014	May 22, 2014 MW
Adobe Solar LLC [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent		90.00%
Acquisitions (Textual) [Abstract]
Power of solar polycrystalline silicon facility		20
Beginning Year Of Output Of Constructed Plant1		2014
Life Output Of Plant		20 years
Cash Consideration for acquisition of the interests in Apex		$ 90.5
Business Acquisition Cost Paid Upon Achievement Of Milestones		4.7
Reimbursable Transmission Costs Receivable		13.4
Macho Springs LLC [Member]
Acquisitions (Textual) [Abstract]
Power of solar polycrystalline silicon facility			50
Beginning Year Of Output Of Constructed Plant1	2014
Life Output Of Plant		20 years
Cash Consideration for acquisition of the interests in Apex	$ 130.0