Sunedison (SUNEQ) Inactive 10-Q12 Nov 132013 Q3 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information Document	9 Months Ended
Document and Entity Information Document	Sep. 30, 2013	Nov. 09, 2013
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'SUNEDISON, INC.	'
Entity Central Index Key	'0000945436	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Document Type	'10-Q	'
Trading Symbol	'SUNE	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	266,604,021

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net sales	$611.50	$601.60	$1,456.40	$1,929.20
Cost of goods sold	550.9	514.7	1,296.90	1,701.80
Gross profit	60.6	86.9	159.5	227.4
Operating expenses:	'	'	'	'
Marketing and administration	91.1	68.9	240.2	235.2
Research and development	18.6	17.4	54.1	55.8
Restructuring and impairment (reversals) charges (see Note 2)	0	-58.3	-5.6	-53
Operating (loss) income	-49.1	58.9	-129.2	-10.6
Non-operating expense (income):	'	'	'	'
Interest expense	45.2	28	127.3	100.3
Interest income	-0.7	-0.9	-2	-2.8
Other, net	5.5	-2.4	9	0.1
Total non-operating expense	50	24.7	134.3	97.6
(Loss) income before income taxes and equity in loss of joint ventures	-99.1	34.2	-263.5	-108.2
Income tax expense (benefit)	17.1	-3.3	50.2	27.9
(Loss) income before equity in loss of joint ventures	-116.2	37.5	-313.7	-136.1
Equity in income (loss) of joint ventures, net of tax	4.1	0.9	3.8	-0.9
Net (loss) income	-112.1	38.4	-309.9	-137
Net loss (income) attributable to noncontrolling interests	4.1	-1.4	9.6	-1.8
Net (loss) income attributable to SunEdison stockholders	($108)	$37	($300.30)	($138.80)
Basic (loss) earnings per share (see Note 8)	($0.47)	$0.16	($1.32)	($0.61)
Diluted (loss) earnings per share (see Note 8)	($0.47)	$0.16	($1.32)	($0.61)

Condensed_Consolidating_Statem

Condensed Consolidating Statements of Comprehensive Income (Loss) Statement (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Other Comprehensive Income [Abstract]	'	'	'	'
Net (loss) income	($112.10)	$38.40	($309.90)	($137)
Net foreign currency translation adjustment	13.7	13.5	-38.7	2.7
Net unrealized gain (loss) on available-for-sale securities	0.8	-2.8	0.9	-1.5
Gain (loss) on hedging instruments	9.7	-0.7	-5.8	-0.8
Actuarial gain (loss) and amortization of prior service cost	1.9	0.2	1.9	-8.9
Other comprehensive income (loss), net of tax	26.1	10.2	-41.7	-8.5
Total comprehensive (loss) income	-86	48.6	-351.6	-145.5
Net loss (income) attributable to noncontrolling interests	4.1	-1.4	9.6	-1.8
Net foreign currency translation adjustment attributable to noncontrolling interests	-4.8	-1.1	-2.2	-1
Comprehensive loss attributable to SunEdison stockholders	($86.70)	$46.10	($344.20)	($148.30)

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:	'	'
Cash and cash equivalents	$640.30	$572.60
Restricted cash	117.1	72.4
Accounts receivable, less allowance for doubtful accounts of $5.1 and $4.4 in 2013 and 2012, respectively	335.3	220.4
Inventories	207.8	247.8
Solar energy systems held for development and sale	356.7	133.8
Prepaid and other current assets	246.1	212.4
Total current assets	1,903.30	1,459.40
Property, plant and equipment, net:	'	'
Non-solar energy systems, net of accumulated depreciation of $981.3 and $891.3 in 2013 and 2012, respectively	1,151.80	1,213.10
Solar energy systems, including consolidated variable interest entities of $299.6 and $53.1 in 2013 and 2012, respectively, net of accumulated depreciation of $107.3 and $72.8 in 2013 and 2012, respectively	1,884.90	1,459.90
Restricted cash	59	50.2
Other assets	566	562.7
Total assets	5,565	4,745.30
Current liabilities:	'	'
Current portion of long-term debt and short term borrowings	19.7	3.4
Short-term solar energy system financing and capital lease obligations, including consolidated variable interest entities of $31.7 and $2.9 in 2013 and 2012, respectively	261.6	97.8
Accounts payable	667.5	477
Accrued Liabilities, Current	408.6	343
Contingent consideration related to acquisitions	26.8	23.1
Deferred revenue for solar energy systems	120.2	113.1
Customer and other deposits	34.8	77.2
Total current liabilities	1,539.20	1,134.60
Long-term debt, less current portion	756.1	758.7
Long-term solar energy system financing and capital lease obligations, less current portion, including consolidated variable interest entities of $364.9 and $69.2 in 2013 and 2012, respectively	2,080.90	1,508.40
Customer and other deposits	165.4	184.5
Deferred revenue for solar energy systems	101.7	146
Non-solar energy system deferred revenue	3.5	29.2
Other liabilities	334.7	306.5
Total liabilities	4,981.50	4,067.90
Redeemable noncontrolling interest	0	11.3
Stockholders' equity:	'	'
Preferred stock, $.01 par value, 50.0 shares authorized, none issued and outstanding in 2013 and 2012	0	0
Common stock, $.01 par value, 300.0 shares authorized, 266.6 and 241.9 shares issued and outstanding in 2013 and 2012, respectively	2.7	2.4
Additional paid-in capital	449	647.7
Retained earnings	119	425.3
Accumulated other comprehensive loss	-83.7	-39.8
Treasury stock, 0 and 10.6 shares in 2013 and 2012, respectively	0	-460.3
Total MEMC stockholders' equity	487	575.3
Noncontrolling interests	96.5	90.8
Total stockholders' equity	583.5	666.1
Total liabilities and stockholders' equity	$5,565	$4,745.30

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Entity Information [Line Items]	'	'
Cash and Cash Equivalents, at Carrying Value	$640.30	$572.60
VIE restricted cash	54.1	1.8
Allowance for doubtful accounts	5.1	4.4
Non-solar energy systems, accumulated depreciation	981.3	891.3
Property, Plant and Equipment - Solar energy systems, consolidated variable interest entities	299.6	53.1
Property, Plant and Equipment - Solar energy systems, accumulated depreciation	107.3	72.8
Short-term solar energy system financing, current portion of solar energy system financing and capital lease obligations, consolidated variable interest entities	31.7	2.9
Long-term solar energy system financing and capital lease obligations, consolidated variable interest entities	364.9	69.2
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	50	50
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.01	$0.01
Common Stock, Shares Authorized	300	300
Common stock, shares issued	266.6	241.9
Treasury stock, shares	0	10.6
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability [Member]	'	'
Entity Information [Line Items]	'	'
Cash and Cash Equivalents, at Carrying Value	$149.30	$6.90

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:	'	'
Net loss	($309.90)	($137)
Adjustments to reconcile net loss to net cash used in operating activities:	'	'
Depreciation and amortization	192.4	168.4
Stock-based compensation	23	22.2
Expense for deferred taxes	40.2	4.3
Other non-cash	-21.8	15.4
Impairment of Long-Lived Assets Held-for-use	0	17.9
Changes in operating assets and liabilities, net of effects of acquisitions:	'	'
Accounts receivable	-95	-50.5
Inventories	44.4	79.4
Solar energy systems held for development and sale	-156.8	-114.5
Accounts payable	105.9	-205.4
Deferred revenue for solar energy systems	-59.2	101
Customer and other deposits	-39.5	-34.7
Accrued liabilities	49.4	-37.5
Other long term liabilities	-38.1	-140.2
Other	-42.6	27.8
Net cash used in operating activities	-307.6	-283.4
Cash flows from investing activities:	'	'
Capital expenditures	-101.2	-100.3
Construction of solar energy systems	-261.3	-193.2
Purchases of cost and equity method investments	-46.6	-35.2
Net proceeds from equity method investments	68.4	3
Change in restricted cash	-16.8	-1.3
Payments to Acquire Businesses, Net of Cash Acquired	-7.3	0
Payments for (Proceeds from) Loans and Leases	0.6	4.8
Other	4.9	-0.1
Net cash used in investing activities	-359.3	-322.3
Cash flows from financing activities:	'	'
Proceeds from second lien term loan	0	196
Cash paid for contingent consideration for acquistions	-0.8	-58
Proceeds from solar energy system financing and capital lease obligations	626.4	720.3
Repayments of solar energy system financing and capital lease obligations	-64.4	-184
Net repayments of customer deposits related to long-term supply agreements	-51.7	-23.6
Principal payments on long-term debt	-1.4	-1.8
Common stock issued (repurchased)	239.6	-0.1
Proceeds from noncontrolling interests	25.9	16.4
Debt financing fees	-25.6	-35.2
Proceeds from (Payments for) Other Financing Activities	-1.4	0
Net cash provided by financing activities	746.6	630
Effect of exchange rate changes on cash and cash equivalents	-12	-0.3
Net increase in cash and cash equivalents	67.7	24
Cash and cash equivalents at beginning of period	572.6	585.8
Cash and cash equivalents at end of period	640.3	609.8
Supplemental schedule of non-cash investing and financing activities:	'	'
Debt transferred to and assumed by buyer upon sale of solar energy systems	55.5	346.2
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$22.40	$0

Basis_of_Presentation

Basis of Presentation	9 Months Ended
Basis of Presentation	Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	At the annual stockholders' meeting on May 30, 2013, stockholders approved a change in the name of the company from MEMC Electronic Materials, Inc. to SunEdison, Inc. As a result of the name change, effective June 3, 2013, the company's stock symbol on the New York Stock Exchange changed from "WFR" to "SUNE" to reflect the new corporate name.

	The accompanying unaudited condensed consolidated financial statements of SunEdison, Inc. and subsidiaries ("SunEdison"), in our opinion, include all adjustments (consisting of normal, recurring items) necessary to present fairly our financial position and results of operations and cash flows for the periods presented. SunEdison has presented the unaudited condensed consolidated financial statements in accordance with the Securities and Exchange Commission's (the "SEC") requirements of Form 10-Q and Article 10 of Regulation S-X and consequently, these financial statements do not include all disclosures required by U.S. generally accepted accounting principles ("U.S. GAAP"). These unaudited condensed consolidated financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2012, which contains SunEdison's audited financial statements for such year. Operating results for the three and nine month periods ended September 30, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013.

	During the three month period ended June 30, 2012, we recorded income tax expense for adjustments to deferred taxes which resulted in a net expense of $6.1 million. These adjustments were out of period because they related to our 2011 consolidated financial statements but were not considered material to our consolidated results of operations in 2011.

	In connection with the preparation of our consolidated financial statements for the nine months ended September 30, 2012, management identified an error and revised the amounts previously presented for cost of goods sold due to a non-cash inventory adjustment which eliminated intercompany profit for the six months ended June 30, 2012. This change increased our cost of goods sold for the nine months ended September 30, 2012 by $22.6 million. We have determined that the effects of these revisions were not material to previously issued financial statements for the three months ended March 31, 2012 and the three and six months ended June 30, 2012. The company revised the condensed consolidated financial statements for the three months ended March 31, 2012 by increasing cost of goods sold by $6.6 million and revised the three and six months ended June 30, 2012 by increasing cost of goods sold by $16.0 million and $22.6 million, respectively, for this item during the first and second quarter 2013 filings that contain these financial statements. This resulted in the net loss increasing from $92.0 million to $98.6 million in the three months ended March 31, 2012 and the net loss increasing from $61.3 million to $77.2 million and from $153.3 million to $175.8 million in the three and six months ended June 30, 2012, respectively.

	In connection with the preparation of our consolidated financial statements for the nine months ended September 30, 2013, we have revised our previously reported balance sheet as of December 31, 2012 to report certain deferred tax balances totaling $43.7 million, which had previously been reported as net deferred taxes. As a result, as of December 31, 2012, "Prepaid Expenses and Other Current Assets" have been revised from $212.2 million to $212.4 million, "Other Assets" have been revised from $519.2 million to $562.7 million, "Accrued Liabilities" have been revised from $344.2 million to $343.0 million and "Other Liabilities" have been revised from $261.6 million to $306.5 million. We have determined the effects of these revisions were not material to previously issued financial statements for the year ended December 31, 2012. The revision had no effect on previously reported statements of operations, comprehensive income (loss), stockholders' equity or cash flows. These revisions have been reflected in this Form 10-Q to the extent applicable and will be reflected for all quarterly and annual periods presented in our future filings.

	Reclassifications
	The accompanying unaudited condensed consolidated financial statements for prior periods contain certain reclassifications to conform to the presentation used in the current period.

	Use of Estimates
	In preparing our condensed consolidated financial statements, we use estimates and assumptions that may affect reported amounts and disclosures. Estimates are used when accounting for investments; depreciation; amortization; leases; accrued liabilities including restructuring, warranties, and employee benefits; derivatives; stock-based compensation; income taxes; solar energy system installation and related costs; percentage-of-completion on long-term construction contracts; the fair value of assets and liabilities recorded in connection with business combinations; and asset valuations, including allowances, among others. These estimates and assumptions are based on current facts, historical experience and various other factors we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities and the recording of revenue, costs and expenses that are not readily apparent from other sources. To the extent there are material differences between the estimates and actual results, our future results of operations would be affected.
	New Accounting Standards Adopted
	In February 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2013-02 ("ASU 2013-02"), Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (AOCI), to provide guidance about AOCI disclosure requirements. ASU 2013-02 does not change the current requirements for reporting net income or other comprehensive income in financial statements; however, it does require an entity to provide information about the amounts reclassified out of AOCI by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. This standard was adopted on January 1, 2013. See Note 10 for further information.

	In February 2012, the FASB issued Accounting Standards Update No. 2012-02, Testing Indefinite-Lived Intangible Assets for Impairment, which amends FASB ASU 2011-08 and states that companies can use a qualitative approach to measuring Intangibles, Goodwill and Other rather than a quantitative approach. In addition, it is not required for an entity to disclose the quantitative information about significant unobservable inputs used in fair value measurements categorized within level 3 of the fair value hierarchy required by paragraph 820-10-50-2 that relate to the financial accounting and reporting for an indefinite-lived intangible asset after its initial recognition. This standard was adopted on January 1, 2013 and did not have a material impact on our consolidated financial statements.

Restructuring_and_Impairment_C

Restructuring and Impairment Charges	9 Months Ended
	Sep. 30, 2013
Restructuring and Related Activities [Abstract]	'
Restructuring and Impairment Charges	'
	Restructuring (Reversals) Charges
	During the second half of 2011, the semiconductor and solar industries experienced downturns, of which the downturn in solar was more severe. In order to better align our business to the then current and expected market conditions in the semiconductor and solar markets, as well as to improve the company's overall cost competitiveness and cash flows across both segments, we committed to a series of restructuring actions to reduce the company's global workforce, right size production capacity and accelerate operating cost reductions in 2012 and beyond (the "2011 Global Plan"). These restructuring actions included reducing the total workforce by approximately 20%, shuttering the company's Merano, Italy polysilicon facility, reducing production capacity at the company's Portland, Oregon crystal facility, slowing the ramp of the Kuching, Malaysia facility, as well as consolidating our solar wafering and solar energy systems operations into a single Solar Energy business unit effective January 1, 2012. The 2011 Global Plan was substantially completed in 2012, except for certain voluntary termination benefits which may be paid in 2013, and ongoing negotiations with certain vendors and suppliers, including those affecting our Merano, Italy polysilicon facility, related to these restructuring activities. We are continuing to evaluate our options for our shuttered polysilicon facility in Merano, Italy. These options include disposal of the facility through sale or other means or reopening the facility, which could occur in the future.

	On August 8, 2013, we entered into a settlement agreement with ReneSola Singapore PTE. LTD (“ReneSola”) relating to the termination of the long-term polysilicon and long-term wafer supply agreement entered on June 9, 2010. This settlement agreement relieved each party of its remaining obligations. In relation to the supply agreement, we made a refundable deposit so that, in the event of a purchase shortfall during the term of the supply agreement, ReneSola could, pursuant to the terms of the supply agreement, apply any remaining deposits toward purchase shortfalls. Prior to the settlement agreement, there was approximately $34.8 million remaining in the refundable deposit. Since ReneSola was entitled to draw down on and retain the remainder of the refundable deposit upon execution of the settlement agreement, we reversed the remaining refundable deposit asset and corresponding customer deposit liability. There was no impact to the condensed consolidated statements of operations as a result of this settlement agreement.
	On September 4, 2012, we executed two settlement agreements with Evonik Industries AG and Evonik Degussa SpA ("Evonik"), one of our suppliers, to settle disputes arising from our early termination of two take-or-pay supply agreements in connection with the 2011 Global Plan. One of the original supply agreements also included a provision for the construction and operation of a chlorosilanes plant located on our existing Merano, Italy polysilicon facility for our benefit. Pursuant to the settlement agreements, we were required to pay Evonik a total of 70.0 million Euro, of which 25.0 million Euro was paid in 2012, 10.0 million Euro was paid in the first quarter of 2013, 20.0 million Euro was paid in the second quarter of 2013, and the remaining 15.0 million Euro was paid in the third quarter of 2013. As a result of these settlement agreements, a favorable adjustment to our 2011 Global Plan accrual was recorded resulting in $69.2 million of income within restructuring and impairment (reversals) charges on the condensed consolidated statement of operations for the period ended September 30, 2012. On December 31, 2012, as part of the settlement with Evonik, we obtained title to the related chlorosilanes plant.
	During the three and nine months ended September 30, 2013, $1.0 million and $7.6 million, respectively, of income was recognized pertaining to the 2011 Global Plan primarily as a result of a reversal of liabilities related to the costs associated with the Merano, Italy polysilicon and other semiconductor facilities due to settlements of certain obligations and changes in estimates, offset by immaterial expenses related to various restructuring activities.
	We incurred tangible asset impairment charges of $14.2 million and $17.3 million, respectively, on solar wafering assets during the three and nine month periods ended September 30, 2012. It was determined that the related assets had no future service potential.
	Details of expenses, cash payments and expected costs related to the 2011 Global Plan are set forth in the following table:


																	As of September 30, 2013
	In millions	Accrued,		Year-to-Date			Cash			Non-Cash Settlements			Currency		Accrued September 30, 2013		Cumulative		Total Costs
		December 31, 2012		Restructuring			Payments										Costs		Expected to be Incurred
				(Reversals)Charges													Incurred
	Severance and other employee benefits	$	31.7	$	(2.0	)	$	(1.6	)	$	—		$	0.5	$	28.6	$	61.2	$	61.2

	Contract termination	134.5		(0.3		)	(59.7		)	(34.8		)	0.4		40.1		164.3		164.3

	Other	38.3		(5.3		)	(5.5		)	—			0.6		28.1		44.4		44.4

	Total	$	204.5	$	(7.6	)	$	(66.8	)	$	(34.8	)	$	1.5	$	96.8	$	269.9	$	269.9

Inventories

Inventories	9 Months Ended
	Sep. 30, 2013
Inventory Disclosure [Abstract]	'
Inventories	'
	Inventories
	Inventories consist of the following:


		As of		As of
	In millions	September 30, 2013		December 31, 2012
	Raw materials and supplies	$	74.2	$	89.1

	Goods and work in process	81		109.1

	Finished goods	52.6		49.6

	Total inventories	$	207.8	$	247.8

	Solar products expected to be sold externally are classified as finished goods and solar products expected to be consumed internally to support our downstream solar business are classified as goods and work in process.

Solar_Energy_Systems_Held_for_

Solar Energy Systems Held for Development and Sale	9 Months Ended
	Sep. 30, 2013
Solar Energy Systems Held For Development and Sale [Abstract]	'
SOLAR ENERGY SYSTEMS HELD FOR DEVELOPMENT AND SALE [Text Block]	'
	Solar Energy Systems Held for Development and Sale
	Solar energy systems held for development and sale consist of the following:


		As of		As of
	In millions	September 30, 2013		December 31, 2012
	Under development	$	338.9	$	133.8

	Systems held for sale	17.8		—

	Total solar energy systems held for development and sale	$	356.7	$	133.8


	As of September 30, 2013, we have $17.8 million of solar energy systems held for sale related to a consolidated variable interest entity. As of December 31, 2012, there were no solar energy systems held for sale.

Debt_and_Capital_Lease_Obligat

Debt and Capital Lease Obligations	9 Months Ended
	Sep. 30, 2013
Debt and Capital Lease Obligations [Abstract]	'
Debt and Capital Lease Obligations	'
	Debt and Capital Lease Obligations
	Debt (including consolidated variable interest entities, "VIEs") and capital lease obligations outstanding consist of the following:


		As of September 30, 2013						As of December 31, 2012
		Total Principal		Current and Short-Term		Long-Term		Total Principal		Current and Short-Term		Long-Term
	In millions
	Non-solar energy system debt:
	Senior notes	$	550	$	—	$	550	$	550	$	—	$	550

	Second lien term loan	196.6		—		196.6		196.1		—		196.1

	Long-term notes and other	29.2		19.7		9.5		16		3.4		12.6

	Total non-solar energy system debt	$	775.8	$	19.7	$	756.1	$	762.1	$	3.4	$	758.7

	Solar energy system debt, financings and capital leaseback obligations:
	Short-term debt, weighted average interest rate of 7.24% and 6.47%, respectively	$	56.5	$	56.5	$	—	$	14.7	$	14.7	$	—

	System pre-construction, construction and term debt	858.8		185.1		673.7		271.3		61.3		210

	Capital leaseback obligations	136.8		7.1		129.7		93.3		7.5		85.8

	Financing leaseback obligations	1,169.60		12.9		1,156.70		1,107.20		14.3		1,092.90

	Other system financing transactions	120.8		—		120.8		119.7		—		119.7

	Total solar energy system debt, financings and capital leaseback obligations	$	2,342.50	$	261.6	$	2,080.90	$	1,606.20	$	97.8	$	1,508.40

	Total debt outstanding	$	3,118.30	$	281.3	$	2,837.00	$	2,368.30	$	101.2	$	2,267.10


	Non-solar Energy System Debt

	Senior Notes

	On March 10, 2011, we issued $550.0 million of 7.75% Senior Notes due April 1, 2019 (the "2019 Notes"). We incurred $13.8 million in debt issuance costs, which are amortized into the condensed consolidated statement of operations over the eight year term. The 2019 Notes were sold at a price equal to 100.0% of the principal amount thereof. The 2019 Notes are guaranteed by certain of SunEdison's domestic subsidiaries (the "guarantors"). The 2019 Notes are senior unsecured obligations and are subordinated to all of our and the guarantors' existing and future secured debt.

	The indenture governing the 2019 Notes contains covenants that limit our and certain subsidiaries' ability, subject to certain exceptions and qualifications, (i) to make certain asset sales, (ii) to make certain restricted payments and investments, (iii) to incur indebtedness and issue preferred stock, (iv) to declare dividends, (v) to make other payments affecting restricted subsidiaries, (vi) to engage in certain transactions with affiliates, and (vii) to merge, consolidate or sell substantially all of our assets. These covenants are subject to a number of qualifications and limitations, and in certain situations, a cross default provision. As of September 30, 2013, we were in compliance with all covenants in the indenture governing the 2019 Notes. In addition, the indenture provides for customary events of default which include (subject in certain cases to customary grace and cure periods), among other things: failure to make payments on the 2019 Notes when due, failure to comply with covenants under the indenture, failure to pay other indebtedness or acceleration of maturity of other indebtedness, failure to satisfy or discharge final judgments and occurrence of bankruptcy events.
	Revolving Credit Facility
	Our corporate revolving credit facility with Bank of America, N.A. is an aggregate principal amount of $400.0 million (the "Credit Facility"). The Credit Facility has a term of three years and expires in March 2014.

	We have amended the Credit Facility from time to time to adjust various covenants to accommodate changes in our business results. Currently, our consolidated leverage ratio covenant under the Credit Facility is 2.5 to 1.0, and our minimum liquidity covenant under the Credit Facility requires a variable minimum liquidity amount based on our trailing twelve month consolidated earnings before interest, taxes, depreciation and amortization (EBITDA). Our minimum liquidity covenant amount under the Credit Facility is $500 million in the event our trailing twelve month consolidated EBITDA is less than $400 million. In the event the trailing twelve month consolidated EBITDA is greater than or equal to $400 million and less than $600 million, our minimum liquidity amount will be $400 million. In the event it is greater than or equal to $600 million and less than $850 million, our minimum liquidity will be $300 million. Finally, if our trailing twelve month consolidated EBITDA is greater than or equal to $850 million, then no minimum liquidity amount is required.

	The Credit Facility contains representations, covenants and events of default typical for credit arrangements of comparable size, including maintaining a consolidated leverage ratio and the variable minimum liquidity amount discussed above. The Credit Facility also contains a customary material adverse effects clause and a cross default clause. The cross default clause is applicable to defaults on other indebtedness in excess of $35 million, excluding our non-recourse indebtedness. Our liquidity position was in excess of the minimum liquidity amount by $410.6 million and our consolidated leverage ratio was 1.7 at September 30, 2013. As of September 30, 2013, we were in compliance with all covenants of the Credit Facility.
	As of September 30, 2013 and December 31, 2012, we had no borrowings outstanding under the Credit Facility, although we had approximately $229.7 million and $121.8 million, respectively, of outstanding third party letters of credit backed by the Credit Facility at such dates, which reduces the available capacity. Therefore, funds available under the Credit Facility were $170.3 million and $278.2 million as of September 30, 2013 and December 31, 2012, respectively.
	Long-term Notes
	Long-term notes at September 30, 2013 primarily consists of $12.5 million owed to a bank by our Japanese subsidiary, are guaranteed by us, and are secured by the property, plant and equipment of our Japanese subsidiary. Such guarantees would require us to satisfy the loan obligations in the event that our Japanese subsidiary failed to pay such debt in accordance with its stated terms. These loans mature in years ranging from 2013 to 2017.

	Second Lien Term Loan
	On September 28, 2012, we entered into a Second Lien Credit Agreement ("Term Loan") with Goldman Sachs Bank USA and Deutsche Bank Securities Inc. providing for a term loan maturing on October 2, 2017 in an aggregate principal amount of $200.0 million, with a 2.0% discount to par for proceeds of $196.0 million. Additionally, we incurred $10.8 million in debt issuance costs, which are amortized into the condensed consolidated statement of operations over the five year term. As of September 30, 2013, the current interest rate on the Term Loan is 10.75%.

	On January 15, 2013, we entered into an interest rate cap with a notional amount of $200.0 million, a cap rate of 1.50%, an effective date of March 28, 2013 and a maturity date of September 30, 2015. The interest rate cap hedges the 3-month LIBOR variable rate maintained within the Term Loan, as described in Note 6.

	Similar to the Credit Facility (discussed above), the Term Loan contains affirmative and negative covenants. These include but are not limited to limiting the company's and certain of our subsidiaries' ability, subject to certain exceptions and qualifications, (i) to create, incur, assume or suffer any liens on assets or revenues, (ii) to make other restricted payments and investments, (iii) to incur indebtedness, (iv) to enter into certain transactions with affiliates, (v) to merge, consolidate or sell/dispose of assets, (vi) to enter into burdensome agreements, (vii) to engage in any material line of business different from current lines, or (viii) to prepay indebtedness or amend indebtedness that adversely affects the Term Loan lenders. These covenants are subject to a number of qualifications and limitations.

	Additionally, the Term Loan has financial covenants requiring a consolidated leverage ratio of 3.0 to 1.0, and minimum liquidity levels depending on our trailing twelve-month consolidated EBITDA and also includes a cross default clause. Our minimum liquidity covenant amount will be $400 million in the event our trailing twelve month consolidated EBITDA is less than $400 million. In the event the trailing twelve month consolidated EBITDA is greater than or equal to $400 million and less than $600 million, our minimum liquidity amount will be $300 million. In the event it is greater than or equal to $600 million and less than $850 million, our minimum liquidity will be $200 million. Finally, if our trailing twelve month consolidated EBITDA is greater than or equal to $850 million then no minimum liquidity amount is required. As of September 30, 2013, we were in compliance with all covenants of the Term Loan.

	Other Financing Commitments
	We have short-term committed financing arrangements of approximately $31.9 million at September 30, 2013, of which there were no short-term borrowings outstanding as of September 30, 2013. Of this amount, $10.5 million is unavailable because it relates to the issuance of third party letters of credit. Interest rates are negotiated at the time of the borrowings.

	During the three month periods ended September 30, 2013 and 2012, we capitalized $6.3 million and $4.3 million of interest, respectively. During the nine months ended September 30, 2013 and 2012, we capitalized $12.9 million and $15.7 million of interest, respectively.

Solar Energy System Debt, Financings and Capital Leaseback Obligations
Our solar energy systems for which we have short-term and long-term debt, capital leaseback and finance obligations are included in separate legal entities that we consolidate. Of this total debt outstanding, $2,294.5 million relates to project specific non-recourse financing that is backed by solar energy system operating assets. This debt has recourse to those separate legal entities but no recourse to SunEdison under the terms of the applicable agreements. These finance obligations are collateralized by the related solar energy system assets. These obligations may also include limited guarantees by SunEdison of contractual obligations related to construction, operations, maintenance and certain indemnities.

Short–term Debt

We have a borrowing capacity of $150.0 million under the current terms of the SunEdison non-recourse project construction revolver. This revolver contains certain covenants that provide if our Corporate Family or Corporate Credit Rating for Moody's Investors Service ("Moody's") falls below "B1" or our Standard & Poor's ("S&P") rating falls below "B+", we will be required to post, at our election, a letter of credit or surety bond equal to 15.0% of the total outstanding balance in order to be able to continue to make additional borrowings under this facility. As of September 30, 2013, our ratings were "B3" and "B+" for Moody's and S&P, respectively. Because our Corporate Family Rating for Moody's was below "B1", a letter of credit equal to 15.0% of the $47.5 million outstanding balance was posted as of September 30, 2013.

This revolver also includes a customary material adverse effects clause whereby a breach may disallow a future draw but not accelerate payment. This revolver also contains a cross default clause whose remedy, among other rights, includes the right to restrict future loans as well as the right to accelerate principal and interest payments. Because this is non-recourse financing, covenants relate specifically to the collateral amounts and transfer of right restrictions.

As of September 30, 2013 and December 31, 2012, there was $47.5 million and $7.4 million, respectively, outstanding on this revolver. In the event additional construction financing is needed, we have the ability to draw upon the available capacity of our Credit Facility (discussed above). In the event we do not have adequate net working capital, such inability to fund future projects may have an adverse impact on our business growth plans, financial position and results of operations.
System Pre-Construction, Construction and Term Debt

SunEdison typically finances its solar energy system projects through project entity specific debt. Construction debt is typically secured by the project entity's assets (mainly the solar energy system), which debt has no recourse to SunEdison. Typically, these financing arrangements provide for a construction loan, which upon completion will be converted into a term loan, and generally do not restrict the future sale of the project entity to a third party buyer.

As of September 30, 2013, SunEdison had total solar energy system pre-construction, construction and term debt outstanding of $858.8 million. Included in this amount is $118.9 million of fixed rate non-recourse debt financing arrangement used to finance the construction of a SunEdison owned solar power plant executed in the third quarter of 2013. Also included in this amount, is $368.2 million related to variable rate debt with interest rates tied to various indexes, including the London Interbank Offered Rate, Euro Interbank Offer Rate, Canadian Dollar Offer Rate or the Prime Rate. A portion of the variable interest rates have been hedged by our outstanding interest rate swaps as discussed in Note 6. The interest rates on the pre-construction, construction and term debt range from 3.0% to 18.0%. The maturities range from 2013 to 2033 and these construction term debt facilities are collateralized by the related solar energy system assets with an aggregate carrying amount of $105.5 million.

During the second quarter of 2012, we violated covenants of two non-recourse solar energy system loans as a result of the devaluation of the local currency (Indian Rupee). On September 28, 2012, we obtained a waiver from the lender for the covenant violation, which has a grace period until November 20, 2013. During the grace period, the debt will be classified as short-term debt. We make no assurance that the covenants will be met after the grace period. The solar energy systems for these two project companies collateralize the loans and there is no recourse outside of the project companies for repayment of this debt. The balance of the non-recourse debt was $24.0 million as of September 30, 2013.

Capital Leaseback Obligations

We are party to master lease agreements that provide for the sale and simultaneous leaseback of certain solar energy systems constructed by us. As of September 30, 2013, we had $136.8 million of capital lease obligations outstanding. Generally, this classification occurs when the term of the lease is greater than 75.0% of the estimated economic life of the solar energy system and the transaction is not subject to real estate accounting. The terms of the leases are typically 25 years, with certain leases providing terms as low as 10 years and providing for early buyout options. The specified rental payments are based on projected cash flows that the solar energy system will generate. Since the acquisition of SunEdison LLC by the company on November 20, 2009, SunEdison has not entered into any arrangements that have resulted in accounting for the sale-leaseback as a capital lease.
Financing Leaseback Obligations
In certain transactions, we account for the proceeds of sale-leasebacks as financings, which are typically secured by the solar energy system assets and its future cash flows from energy sales, but without recourse to SunEdison under the terms of the arrangement. The structure of the repayment terms under the lease typically results in negative amortization throughout the financing period, and we therefore recognize the lease payments as interest expense. The balance outstanding for sale-leaseback transactions recorded as financings as of September 30, 2013 is $1,169.6 million, which includes the transactions discussed below. The maturities range from 2021 to 2038 and are collateralized by the related solar energy system assets with a carrying amount of $1,186.5 million.

On March 31, 2011, one of SunEdison's project subsidiaries executed a master lease agreement with a U.S. financial institution which provides for the sale and simultaneous leaseback of certain solar energy systems constructed by SunEdison. The total capacity under this agreement is $120.0 million, of which $101.8 million is outstanding and $18.2 million is available as of September 30, 2013. The specified rental payments will be based on projected cash flows that the solar energy systems will generate.

On June 27, 2012, one of SunEdison's subsidiaries executed a master lease agreement with a U.S. financial institution which provides for the sale and simultaneous leaseback of certain solar energy systems. The total capacity under this agreement is $50.0 million, of which $12.0 million is outstanding and $38.0 million is available as of September 30, 2013. The specified rental payments will be based on projected cash flows that the solar energy systems will generate.

On September 24, 2012, one of SunEdison's project subsidiaries executed a master lease agreement with a U.S. financial institution which provides for the sale and simultaneous leaseback of certain solar energy systems constructed by SunEdison. The total capacity under this agreement is $102.0 million, of which $55.9 million is outstanding and $46.1 million is available as of September 30, 2013. The specified rental payments will be based on projected cash flows that the solar energy systems will generate.
Other System Financing Transactions

Other system financing transactions represent the cash proceeds that SunEdison received in connection with an executed solar energy system sales contract that has not met the sales recognition requirements under real estate accounting and has been accounted for as a financing. Included in other system financing is $18.0 million of proceeds collected under three separate solar energy system sales agreements with the buyer that provides the buyer with a put option that could become an obligation in the event that we are unable to fulfill certain performance warranties set to expire during 2015. The remaining portion of other system financings of $102.8 million relates to cash proceeds received in connection with separate solar energy system sales contracts for which SunEdison has substantial continuing involvement. There are no principal or interest payments associated with these transactions. These amounts are expected to be recorded to revenue when the contractual provisions and indemnifications expire as adjusted for actual losses.

Derivatives_and_Hedging_Instru

Derivatives and Hedging Instruments	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivatives and Hedging Instruments	'
	Derivatives and Hedging Instruments
	SunEdison’s derivatives and hedging activities consist of:



			Assets (Liabilities or Equity) Fair Value
	In millions	Balance Sheet Location	As of September 30, 2013			As of December 31, 2012
	Derivatives designated as hedging:
	Cross currency swaps	Accrued liabilities	$	(7.8	)	$	—

	Cross currency swaps	Accumulated other comprehensive loss	$	7.8		$	—

	Interest rate swaps	Accrued liabilities and other liabilities	$	(28.6	)	$	(5.0	)
	Interest rate swaps	Accumulated other comprehensive loss	$	2.3		$	4.3

	Interest rate cap	Prepaid and other current assets	$	0.2		$	—

	Interest rate cap	Accumulated other comprehensive income	$	(0.2	)	$	—

	Derivatives not designated as hedging:
	Suntech warrant	Other assets	$	0.2		$	0.2

	Currency forward contracts	Prepaid and other current assets	$	1.7		$	0.5

	Currency forward contracts	Accrued liabilities	$	(1.4	)	$	(7.1	)
	Interest rate swaps	Prepaid and other current assets	$	0.1		$	—

	Interest rate swaps	Accrued liabilities	$	(0.4	)	$	—





			Losses (Gains)						Losses (Gains)
			Three Months Ended September 30,						Nine Months Ended September 30,
	In millions	Statement of Operations Location	2013			2012			2013		2012
	Derivatives not designated as hedging:
	Suntech warrant	Other, net	$	(0.2	)	$	0.2		$	—	$	0.4

	Currency forward contracts	Other, net	$	(4.3	)	$	(7.6	)	$	6.2	$	(6.4	)

	Interest rate swaps	Interest expense	$	1.1		$	—		$	1.4	$	—

	To mitigate financial market risks of foreign currency exchange rates, we utilize currency forward contracts. We do not use derivative financial instruments for speculative or trading purposes. We generally hedge transactional currency risks with currency forward contracts. Gains and losses on these foreign currency exposures are generally offset by corresponding losses and gains on the related hedging instruments, reducing our net exposure. A substantial portion of our revenue and capital spending is transacted in U.S. Dollars. However, we do enter into transactions in other currencies, primarily the Euro, the Japanese Yen, the South African Rand and certain other Asian currencies. To protect against reductions in value and volatility of future cash flows caused by changes in foreign exchange rates, we have established transaction-based hedging programs. Our hedging programs reduce, but do not always eliminate, the impact of foreign currency exchange rate movements. At any point in time, we may have outstanding contracts with several major financial institutions for these hedging transactions. Our maximum credit risk loss with these institutions is limited to any gain on our outstanding contracts. As of September 30, 2013 and December 31, 2012, these currency forward contracts had aggregate notional amounts of $353.8 million and $320.5 million, respectively, and are accounted for as economic hedges.
	During the second quarter of 2013, we entered into a cross currency swap with a notional amount of $185.8 million accounted for as a cash flow hedge. The amounts recorded to the condensed consolidated balance sheet, as provided in the table above, represent the fair value of the net amount that would settle on the balance sheet date if the swap was transferred to other third parties or canceled by us. The effective portion of this cash flow hedge instrument during the three and nine month periods ended September 30, 2013 was recorded to accumulated other comprehensive income (loss) on the condensed consolidated balance sheet. No ineffectiveness was recognized during the three and nine month periods ended September 30, 2013.
	We have interest rate swap instruments with notional amounts totaling approximately $178.4 million and $40.7 million at September 30, 2013 and December 31, 2012, respectively, that are used to hedge floating rate debt. Some of these hedges are designated as cash flow hedges while others are designated as economic hedges. Under the interest rate swap agreements, we pay the fixed rate and the counterparty to the agreements pays us a floating interest rate. The amount recorded to the condensed consolidated balance sheet, as provided in the table above, represents the fair value of the net amount that we would settle on the balance sheet date if the agreements were transferred to other third parties or canceled by us. The effective portion of the cash flow hedges during the three and nine month periods ended September 30, 2013 and 2012 were recorded to accumulated other comprehensive income (loss) on the condensed consolidated balance sheets while the changes in fair value of the economic hedges were recorded to interest expense (income) within the condensed consolidated statement of operations. No ineffectiveness related to the cash flow hedges was recognized during the three and nine month periods ended September 30, 2013 and 2012.
	On January 15, 2013, we entered into an interest rate cap with a notional amount of $200.0 million, a cap rate of 1.50%, an effective date of March 28, 2013 and a maturity date of September 30, 2015. The interest rate cap hedges the 3-month LIBOR variable rate maintained within the $200.0 million Term Loan. Under the agreement, we pay the fixed rate and the counterparty to the agreement pays SunEdison a floating interest rate. The interest rate cap is designated as a cash flow hedge. The changes in fair value are recorded to accumulated other comprehensive income (loss) on the condensed consolidated balance sheets, with any ineffectiveness recorded in the condensed consolidated statement of operations. No such ineffectiveness was recognized during the three and nine month periods ended September 30, 2013.
	As of September 30, 2013, we have upward amortizing interest rate swap agreements that are used as an economic hedge related to several consolidated solar energy system projects for which we own 8.2% of the project companies. These instruments are used to hedge floating rate debt with a construction loan availability of $200.0 million and are not designated as a cash flow hedge. Under the swap agreement, we pay the fixed rate and the counterparty to the agreement pays us a floating interest rate. The amount recorded in the condensed consolidated balance sheet, as provided in the table above, represents the estimated fair value of the net amount that we would settle on September 30, 2013 if the agreements were transferred to other third parties or cancelled by us. Because these agreements are designated as an economic hedge and not accounted for under hedge accounting, the changes in fair value are recorded to interest expense (income) within the condensed consolidated statement of operations. During the three and nine month periods ended September 30, 2013, we recorded $0.7 million and an immaterial amount to interest expense, respectively, for fair value adjustments. These amounts are reduced in the condensed consolidated statement of operations by approximately $0.6 million and an immaterial amount, respectively, attributable to a non-controlling interest representing the 91.8% of the project companies we do not own. We also have an upward amortizing interest rate swap agreement that is designated as a cash flow hedge related to a solar energy system project. This instrument is used to hedge floating rate debt with a construction loan availability of $185.8 million. The changes in fair value are recorded to accumulated other comprehensive income (loss) on the condensed consolidated balance sheets, as provided in the table above, with any ineffectiveness recorded in the condensed consolidated statement of operations. No such ineffectiveness was recognized during the three and nine month periods ended September 30, 2013.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements

	The following table summarizes the financial instruments measured at fair value on a recurring basis classified in the fair value hierarchy (Level 1, 2 or 3) based on the inputs used for valuation in the accompanying condensed consolidated balance sheets:



	In millions	As of September 30, 2013												As of December 31, 2012
	Assets (liabilities):	Level 1			Level 2			Level 3			Total			Level 1			Level 2			Level 3			Total
	Available-for-sale investments	$	—		$	14.3		$	—		$	14.3		$	—		$	13.4		$	—		$	13.4

	Suntech warrant	—			—			0.2			0.2			—			—			0.2			0.2

	Interest rate swap liabilities	—			(29.0		)	—			(29.0		)	—			(5.0		)	—			(5.0		)

	Interest rate swap assets	—			0.1			—			0.1			—			—			—			—

	Interest rate cap	—			0.2			—			0.2			—			—			—			—

	Currency forward liabilities	(1.4		)	—			—			(1.4		)	(6.6		)	—			—			(6.6		)

	Currency forward assets	1.7			—			—			1.7			—			—			—			—

	Cross currency swaps	—			(7.8		)	—			(7.8		)	—			—			—			—

	Contingent consideration related to acquisitions	—			—			(50.4		)	(50.4		)	—			—			(24.9		)	(24.9		)

	Total	$	0.3		$	(22.2	)	$	(50.2	)	$	(72.1	)	$	(6.6	)	$	8.4		$	(24.7	)	$	(22.9	)

	There were no transfers into or out of Level 1, Level 2 or Level 3 financial instruments during the three and nine month periods ended September 30, 2013.
	The following table summarizes changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the nine months ended September 30, 2012 and September 30, 2013:



	In millions	Suntech			Contingent			Total
		Warrant			Consideration
					Related to
					Acquisitions
	Balance, December 31, 2011	$	0.5		$	(90.8	)	$	(90.3	)

	Total unrealized losses included in earnings (1)	(0.4		)	(11.5		)	(11.9		)
	Acquisitions, sales, redemptions and payments	—			67.3			67.3

	Balance, September 30, 2012	$	0.1		$	(35.0	)	$	(34.9	)

	Balance, December 31, 2012	$	0.2		$	(24.9	)	$	(24.7	)

	Total unrealized losses included in earnings (1)	—			(3.1		)	(3.1		)

	Acquisitions	—			(22.4		)	(22.4		)

	Balance, September 30, 2013	$	0.2		$	(50.4	)	$	(50.2	)

	The amount of total losses for the nine months ended September 30, 2013 included in earnings attributable to the change in unrealized losses relating to assets and liabilities still held at the reporting date	$	—		$	(3.1	)	$	(3.1	)

	__________________________

	(1)	Amounts included in earnings are recorded to non-operating expense (income) in the condensed consolidated statement of operations, except for the amount included in marketing and administration for the contingent consideration related to acquisitions, for which changes to the fair value were recorded to operating income (loss) in the condensed consolidated statement of operations.
	The following table presents the carrying amount and estimated fair value of our outstanding short-term debt, long-term debt and capital lease obligations as of September 30, 2013 and December 31, 2012:


		As of September 30, 2013						As of December 31, 2012
	In millions	Carrying Amount			Estimated Fair Value (1)			Carrying Amount			Estimated Fair Value (1)
	Total debt and capital lease obligations	$	3,118.30		$	2,721.70		$	2,368.30		$	1,736.20

__________________________

(1)	Fair value of our debt, excluding our $550.0 million 2019 Notes and the $200.0 million Term Loan, is calculated using a discounted cash flow model with consideration for our non-performance risk (Level 3 assumptions). The estimated fair value of our 2019 Notes and Term Loan were based on a broker quotation (Level 1). The estimated fair value of our solar energy system debt related to sale-leasebacks is significantly lower than the carrying value of such debt because the fair value estimate is based on the fair value of our fixed lease payments over the term of the leases (Level 3 assumptions). Under real estate accounting, this debt is recorded as a financing obligation, and substantially all of our lease payments are recorded as interest expense with little to no reduction in our debt balance over the term of the lease. As a result, our outstanding sale-leaseback debt obligations will generally result in a one-time gain recognition at the end of the leases for the full amount of the debt. The timing difference between expense and gain recognition will result in increased expense during the term of the leases with a significant book gain at the end of the lease.

Income_loss_Per_Share

Income (loss) Per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Income (loss) Per Share	'
	(Loss) Earnings Per Share

	For the three month periods ended September 30, 2013 and 2012, basic and diluted (loss) earnings per share (“EPS”) was calculated as follows:


		Three Months Ended September 30, 2013						Three Months Ended September 30, 2012
	In millions, except per share amounts	Basic			Diluted			Basic			Diluted
	EPS Numerator:
	Net (loss) income attributable to SunEdison stockholders	$	(108.0	)	$	(108.0	)	$	37		$	37

	Adjustment of redeemable noncontrolling interest	(2.4		)	(2.4		)	(0.9		)	(0.9		)
	Adjusted net (loss) income to SunEdison stockholders	$	(110.4	)	$	(110.4	)	$	36.1		$	36.1


	EPS Denominator:
	Weighted-average shares outstanding	236.9			236.9			230.9			230.9

	Stock options and restricted stock units	—			—			—			1.1

	(Loss) earnings per share	$	(0.47	)	$	(0.47	)	$	0.16		$	0.16

	For the nine month periods ended September 30, 2013 and 2012, basic and diluted EPS was calculated as follows:


		Nine Months Ended September 30, 2013						Nine Months Ended September 30, 2012
	In millions, except per share amounts	Basic			Diluted			Basic			Diluted
	EPS Numerator:
	Net loss attributable to SunEdison stockholders	$	(300.3	)	$	(300.3	)	$	(138.8	)	$	(138.8	)
	Adjustment of redeemable noncontrolling interest	(6.8		)	(6.8		)	(0.9		)	(0.9		)
	Adjusted net loss to SunEdison stockholders	$	(307.1	)	$	(307.1	)	$	(139.7	)	$	(139.7	)

	EPS Denominator:
	Weighted-average shares outstanding	233.3			233.3			230.8			230.8

	Loss per share	$	(1.32	)	$	(1.32	)	$	(0.61	)	$	(0.61	)

	For the three and nine month periods ended September 30, 2013 and 2012, the numerator of the EPS calculation included the amount recorded to adjust the redeemable noncontrolling interest balance to redemption value. In subsequent periods, as a result of the Share Sale Agreement entered into with the noncontrolling interest holder (see Note 9), the numerator of the EPS calculation will be reduced by the noncontrolling interest holder’s share of any earnings of the subsidiary until we have repurchased all of the noncontrolling interest holder’s shares.

	Weighted-average shares outstanding for the three and nine months periods ended September 30, 2013 includes the impact of the issuance of 34,500,000 shares of common stock on September 18, 2013 in a registered public offering (see Note 9).
	For the three and nine months ended September 30, 2013, and for the nine month period ended September 30, 2012, all options to purchase SunEdison stock and restricted stock units were excluded from the calculation of diluted EPS because the effect was antidilutive due to the net loss incurred for the respective periods. For the three months ended September 30, 2012, 31.7 million shares of stock options and restricted stock units were excluded from the calculation of diluted EPS because the effect was antidilutive.

Stockholders_Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2013
Stockholders' Equity Note [Abstract]	'
Shareholders' Equity	'
	Stockholders’ Equity and Redeemable Noncontrolling Interest
	On September 18, 2013, we completed the issuance and sale in a registered public offering (the "Offering") of 34,500,000 shares of the Company's common stock, par value $0.01 per share, at a public offering price of $7.25 per share, less discounts and commissions of $0.29 per share. All of the shares of common stock previously held as treasury stock were issued in connection with the Offering. We received net proceeds of approximately $239.6 million, after deducting underwriting discounts and commissions and related offering costs.
	The following table presents the change in total stockholders' equity for the nine month period ended September 30, 2013:



	In millions	SunEdison Stockholders’				Noncontrolling				Total Stockholders' Equity				Redeemable Noncontrolling Interest
		Equity				Interest
	Balance, January 1, 2013	$	575.3			$	90.8			$	666.1			$	11.3

	Net loss	(300.3		)		(6.4		)		(306.7		)		(3.2		)
	Translation adjustment, net	(40.9		)		2.2				(38.7		)		—

	Adjustment of redeemable noncontrolling interest	(6.8		)		—				(6.8		)		6.8

	Reclassification of redeemable noncontrolling interest to liability	—				—				—				(14.9		)

	Other comprehensive loss, net of tax	(3.0		)		—				(3.0		)		—

	Stock plans, net	22.4				—				22.4				—

	Issuance of common stock	239.6				—				239.6				—

	Deconsolidation of entities	0.1				(6.2		)		(6.1		)		—

	SunEdison - contributions from partner	0.6				16.1				16.7				—

	Balance, September 30, 2013	$	487			$	96.5			$	583.5			$	—

	Stock-Based Compensation
	We have equity incentive plans that provide for the award of non-qualified stock options, restricted stock, performance shares, and restricted stock units to employees, non-employee directors and consultants. As of September 30, 2013, there were 5.2 million shares available for future grant under these plans. During the second quarter of 2013, 16.5 million shares were registered for issuance under our equity incentive plan pursuant to a plan amendment approved by our stockholders at the annual stockholders' meeting on May 30, 2013. In September 2013, 5.6 million of these newly registered shares were issued in connection with the Offering discussed above.
	The following table presents information regarding outstanding stock options as of September 30, 2013 and changes during the nine month period then ended:


		Shares			Weighted-				Aggregate Intrinsic				Weighted-
					Average				Value				Average
					Exercise Price				(in millions)				Remaining
													Contractual
													Life
													(in years)
	Outstanding at December 31, 2012	21,411,119			$	6.12

	Granted	5,778,183			8.74

	Exercised	(183,102	)		3.02

	Forfeited	(2,550,469	)		5.66

	Expired	(431,628	)		20.01

	Outstanding at September 30, 2013	24,024,103			$	6.57			$	73.5			8

	Options exercisable at September 30, 2013	4,546,599			$	12.27			$	6.6			6


	The weighted-average grant-date fair value per share of options granted was $3.99 and $1.18 for the nine month periods ended September 30, 2013 and 2012, respectively.
	The following table presents information regarding outstanding restricted stock units as of September 30, 2013 and changes during the nine month period then ended:


		Restricted Stock			Aggregate Intrinsic				Weighted-
		Units			Value				Average Remaining
					(in millions)				Contractual Life
									(in years)
Outstanding at December 31, 2012	4,401,768

Granted	1,304,560

Converted	(852,204	)
Forfeited	(641,828	)
Outstanding at September 30, 2013	4,212,296			$	35.8			2


The weighted-average fair value of restricted stock units per share on the date of grant was $8.74 and $3.09 for the nine month periods ended September 30, 2013 and 2012, respectively.
Stock-based compensation expense for the three month periods ended September 30, 2013 and 2012 was $8.8 million and $7.5 million, respectively. For the nine month periods ended September 30, 2013 and 2012, stock based compensation expense was $22.6 million and $21.9 million, respectively.

Redeemable Noncontrolling Interest

On June 27, 2012, we issued redeemable common stock in certain consolidated subsidiaries to a non-affiliated third party for $10.4 million in proceeds (net of stock issuance costs) representing a 15% noncontrolling interest in those consolidated subsidiaries, which was initially reported as Redeemable Noncontrolling Interest in the temporary equity section on the condensed consolidated balance sheet. On September 24, 2013, we entered into a Share Sale Agreement with the noncontrolling interest holder, pursuant to which we agreed to repurchase the shares of redeemable common stock for a total of $14.9 million in four installments with payments beginning January 15, 2014 and continuing each quarter through October 15, 2014.

As a result of our unconditional obligation under the Share Sale Agreement, the amount previously reported as Redeemable Noncontrolling Interest was reclassified to Accrued Liabilities and Other Liabilities in the condensed consolidated balance sheet and adjusted to reflect the fair value of our obligation, which resulted in a reduction in retained earnings of $2.4 million.

Comprehesive_Income_Notes

Comprehesive Income (Notes)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Comprehensive Income (Loss) Note [Text Block]	'
	Comprehensive Loss

	Comprehensive income (loss) represents a measure of all changes in equity that result from recognized transactions and other economic events other than transactions with owners in their capacity as owners. Other comprehensive loss includes foreign currency translations, gains (losses) on available-for-sale securities, gains (losses) on hedging instruments and pension adjustments.

	The following table presents the changes in each component of accumulated other comprehensive loss, net of tax:


	In millions	Foreign Currency Items (1)				Available-for-sale Securities				Hedging Activities				Pension Plans				Accumulated Other Comprehensive Loss
	Balance, December 31, 2012	$	32.3			$	(7.6	)		$	(4.3	)		$	(60.2	)		$	(39.8	)

	Other comprehensive (loss) income before reclassifications	(40.9		)		0.9				(5.4		)		1.9				(43.5		)

	Amounts reclassified from accumulated other comprehensive income	—				—				(0.4		)		—				(0.4		)

	Net current-period other comprehensive (loss) income	(40.9		)		0.9				(5.8		)		1.9				(43.9		)

	Balance, September 30, 2013	$	(8.6	)		$	(6.7	)		$	(10.1	)		$	(58.3	)		$	(83.7	)
	__________________________

	(1)	Excludes foreign currency adjustments as it relates to noncontrolling interests. Refer to the condensed consolidated statements of comprehensive loss.

	The following table presents the changes in each component of accumulated other comprehensive loss, net of tax, and the affected line in the condensed consolidated statement of operations for reclassifications:


		Three Months Ended September 30, 2013				Nine Months Ended September 30, 2013
	In millions	Net of Tax Amount				Net of Tax Amount
	Foreign currency translation adjustments	$	8.9			$	(40.9	)

	Unrealized gain on available-for-sale securities	0.8				0.9

	Unrealized gain (loss) on hedging instruments	9.7				(5.4		)

	Loss on settlements of hedging instruments (1)	—				(0.4		)

	Actuarial gain	1.9				1.9

	Other comprehensive income (loss)	$	21.3			$	(43.9	)

	__________________________

	-1	These other comprehensive loss components are included in interest expense.
	Unaudited Condensed Consolidating Statement of Comprehensive Loss
	Three Months Ended September 30, 2013
	(In millions)



		SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
	Net (loss) income	$	(108.0	)		$	(273.8	)		$	87.4			$	182.3			$	(112.1	)

	Other comprehensive income (loss), net of tax:
	Net foreign currency translation adjustment	—				—				13.7				—				13.7

	Net unrealized gain (loss) on available-for-sale securities	—				—				0.8				—				0.8

	Unrealized gain on hedging instruments	0.5				—				9.2				—				9.7

	Actuarial gain (loss) and amortization of prior service cost	1.9				—				—				—				1.9

	Other comprehensive loss, before reclassifications	2.4				—				23.7				—				26.1

	Amounts reclassified out of AOCI(1)	—				—				—				—				—

Other comprehensive income, net of tax	2.4				—				23.7				—				26.1

Total comprehensive (loss) income	$	(105.6	)		$	(273.8	)		$	111.1			$	182.3			$	(86.0	)

Net income attributable to noncontrolling interests	—				(0.5		)		4.6				—				4.1

Net foreign currency translation adjustment attributable to noncontrolling interests	—				—				(4.8		)		—				(4.8		)

Comprehensive (loss) income attributable to SunEdison stockholders	$	(105.6	)		$	(274.3	)		$	110.9			$	182.3			$	(86.7	)

Unaudited Condensed Consolidating Statement of Comprehensive Loss
Three Months Ended September 30, 2012
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
Net income (loss)	$	37			$	15.6			$	105.5			$	(119.7	)		$	38.4

Other comprehensive income (loss), net of tax:
Net foreign currency translation adjustment	—				—				13.5				—				13.5

Net unrealized loss on available-for-sale securities	—				—				(2.8		)		—				(2.8		)

Unrealized loss on hedging instruments	—				—				(0.7		)		—				(0.7		)

Actuarial gain (loss) and amortization of prior service cost	0.2				—				—				—				0.2

Other comprehensive income, net of tax	0.2				—				10				—				10.2

Total comprehensive income (loss)	$	37.2			$	15.6			$	115.5			$	(119.7	)		$	48.6

Net income attributable to noncontrolling interests	—				(0.4		)		(1.0		)		—				(1.4		)

Net translation adjustment attributable to noncontrolling interests	—				—				(1.1		)		—				(1.1		)

Comprehensive income (loss) attributable to SunEdison stockholders	$	37.2			$	15.2			$	113.4			$	(119.7	)		$	46.1

Income_Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2013
Income Tax Expense (Benefit) [Abstract]	'
Income Taxes	'
	Income Taxes

	In general, we record income tax expense (benefit) each quarter based on our best estimate as to the full year's effective tax rate. This estimated tax expense (benefit) is reported based on a pro-ration of the actual income earned in the period divided by the full year forecasted income (loss). There are certain items, however, which are given discrete period treatment, and the tax effects of those items are reported in the quarter that such events arise. Items that give rise to discrete recognition include (but are not limited to) finalizing tax authority examinations, changes in statutory tax rates and expiration of a statute of limitations.

	The process for calculating income tax expense (benefit) includes estimating current taxes due and assessing temporary differences between the recognition of assets and liabilities for tax and financial statement reporting purposes. The income tax expense in the three and nine month periods ended September 30, 2013 is associated with the result of the worldwide operational earnings mix at various rates and a net decrease to the accrual for uncertain tax positions due to the conclusion of the 2007-2010 Internal Revenue Service (“IRS”) examination, as separately discussed below. We regularly review our deferred tax assets for realizability, taking into consideration all available evidence, both positive and negative, including cumulative losses, projected future pre-tax and taxable income (losses), the expected timing of the reversals of existing temporary differences and the expected impact of tax planning strategies. Our total deferred tax assets, net of valuation allowance, as of September 30, 2013 and December 31, 2012, were $45.5 million and $84.9 million, respectively. We believe that it is more likely than not, based on our projections of future taxable income in certain jurisdictions, that we will generate sufficient taxable income to realize the benefits of the net deferred tax assets which have not been offset by a valuation allowance at September 30, 2013.

	We are subject to income taxes in the United States and numerous foreign jurisdictions. From time to time, we are subject to income tax audits in these jurisdictions. We believe that our tax return positions are fully supported, but tax authorities may challenge certain positions, which may not be fully sustained. Our income tax expense includes amounts intended to satisfy income tax assessments that may result from these challenges. Determining the income tax expense for these potential assessments and recording the related assets and liabilities requires significant judgments and estimates. Tax benefits are recognized only for tax positions that are more likely than not to be sustained upon examination by tax authorities. We review our liabilities quarterly, and we may adjust such liabilities due to proposed assessments by tax authorities, changes in facts and circumstances, issuance of new regulations or new case law, negotiations between tax authorities of different countries concerning our transfer prices, the resolution of entire audits or the expiration of statutes of limitations. Adjustments, if required, are most likely to occur in the year during which major audits are closed. The total amount accrued for uncertain tax positions decreased $36.2 million during the nine month period ended September 30, 2013. The decrease was due the closure of the 2007-2010 IRS examination, as separately discussed below. The total accrual for uncertain tax positions as of September 30, 2013 and December 31, 2012 was $17.0 million and $53.2 million, respectively.

	During the first nine months of 2013, we determined the undistributed earnings of one of our foreign wholly owned subsidiaries would be remitted to the United States in the foreseeable future. These earnings were previously considered permanently reinvested in the business and the unrecognized deferred tax assets related to these earnings was not recognized. The deferred tax effect of these newly planned remittances was recorded as a discrete deferred tax benefit in the amount of $67.4 million, which was fully offset by a valuation allowance. The undistributed earnings of all other foreign subsidiaries are not expected to be remitted to the U.S. parent corporation in the foreseeable future. We plan foreign remittance amounts based on projected cash flow needs as well as the working capital and long-term investment requirements of our foreign subsidiaries and our domestic operations. Of our cash and cash equivalents as of September 30, 2013, approximately $396.8 million was held by our foreign subsidiaries, a portion of which may be subject to repatriation tax effects.

	During the quarter ended September 30, 2013, the IRS concluded its examination of our U.S. federal income tax returns for 2007 through 2010 and, as a result, we recorded favorable and unfavorable adjustments to our accrual for uncertain tax positions. The IRS finalized taxable income adjustments related to various cost allocations and taxable income adjustments attributable to our foreign operations. Our settlement of those positions with the IRS resulted in an increase to the income tax provision of $7.8 million which was accrued in the first quarter of 2013. Additionally, we had uncertain tax positions for deductions and tax credits that were effectively settled during the exam which reduced the accrual for uncertain tax positions by $33.2 million. The resolution of these matters resulted in an assessment of $11.8 million, which includes interest of $1.9 million (net of $1.0 million of federal tax benefit). The net effect to our 2013 tax provision from closure of the IRS examination was $9.6 million of tax expense.

	We are currently under examination by the IRS for the 2011 tax year. We are also under examination by certain foreign tax jurisdictions. We believe it is reasonably possible that some portions of these examinations could be completed within the next twelve months and have currently recorded amounts in the financial statements that are reflective of the current status of these examinations.

Variable_Interest_Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2013
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]	'
Variable Interest Entities	'
	Variable Interest Entities

	Variable interest entities are generally entities that lack sufficient equity to finance their activities without additional financial support from other parties or whose equity holders, as a group, lack one of more of the following characteristics: (a) direct or indirect ability to make decisions, (b) obligation to absorb expected losses or (c) right to receive expected residual returns. We may establish joint ventures with non-related parties to share in the risks and rewards associated with solar energy system development, which are facilitated through equity ownership of solar energy related entities. We consolidate these solar energy related entities if we maintain the power to direct the activities which most significantly impact the solar energy related entity's performance and share significantly in the risks and rewards of the solar energy related entity.
	We are the primary beneficiary of ten VIEs in solar energy related entities that we consolidated as of September 30, 2013. The carrying amounts and classification of our consolidated VIEs' assets and liabilities included in our condensed consolidated balance sheet are as follows:


	In millions	As of September 30, 2013			As of December 31, 2012
	Current assets	$	325.1		$	10.3

	Noncurrent assets	329.8			56.2

	Total assets	$	654.9		$	66.5

	Current liabilities	$	(121.3	)	$	(8.5	)
	Noncurrent liabilities	(449.4		)	(69.6		)
	Total liabilities	$	(570.7	)	$	(78.1	)

	The amounts shown in the table above exclude intercompany balances, which are eliminated upon consolidation. All of the assets in the table above are restricted for settlement of the VIE obligations and all of the liabilities in the table above can only be settled using VIE resources. There are no material VIEs for which we determined we were not the primary beneficiary.

	During the third quarter of 2013, a VIE (Existing VIE) consolidated by us made an investment in an entity that was determined to be a VIE (New VIE) for which our consolidated Existing VIE was determined to be the primary beneficiary. Therefore, we have consolidated the underlying New VIE as of September 30, 2013. On July 26, 2013 New VIE acquired a solar energy business and performed preliminary purchase accounting with respect to the assets acquired and liabilities assumed. The initial accounting for the business combination is not complete as of September 30, 2013 because additional time is needed to obtain all of the data required to complete the acquisition accounting, including finalization of procedures to determine the estimated fair value of the assets acquired and liabilities assumed. Therefore, provisional amounts were used in the consolidation of New VIE as of July 26, 2013. These amounts are subject to change based on the finalization of the purchase accounting, including finalization of fair value measurements. The acquired business has certain third-party financial obligations which have no recourse to the general credit of the primary beneficiary or the Company. As of September 30, 2013 and for the period from July 26, 2013 to September 30, 2013, the total assets and liabilities of New VIE and the net loss attributable to SunEdison stockholders recorded in the condensed consolidated balance sheet and statement of operations were $335.6 million, $334.9 million, and $0.4 million, respectively. Future decisions made by New VIE, including potential changes to its capital structure, may impact our consolidation of New VIE in future periods.

Deferred_Revenue_and_Profit

Deferred Revenue and Profit	9 Months Ended
	Sep. 30, 2013
Deferred Revenue Disclosure [Abstract]	'
Deferred Revenue and Profit	'
	Revenue and Profit Deferrals
	Deferred revenue consists of the following:



	In millions	As of September 30, 2013		As of December 31, 2012
	Deferred revenue for solar energy systems:
	Short-term profit deferrals and deposits on solar energy system sales	$	120.2	$	113.1

	Long-term profit deferrals and deposits on solar energy system sales	82.1		126.4

	Deferred subsidy revenue	19.6		19.6

	Total solar energy system deferred revenue	$	221.9	$	259.1

	Non-solar energy system deferred revenue:
	Short-term deferred revenue	—		—

	Long-term deferred revenue	3.5		29.2

	Total non-solar energy system deferred revenue	3.5		29.2

	Total deferred revenue	$	225.4	$	288.3


	On September 30, 2013, we terminated our long-term solar wafer supply agreement with Gintech Energy Corporation (“Gintech”) originally entered into on October 25, 2006 and subsequently amended. Under the terms of the original supply agreement, we were to supply Gintech with solar wafers at agreed upon prices on a take or pay basis, and Gintech was required to advance funds to us in the form of both refundable and non-refundable deposits. As part of a separate agreement, we also acquired shares of Gintech stock and shares of stock in a related Gintech entity at amounts deemed to be less than fair value. The non-refundable deposit was recorded as deferred revenue since it could only be fully retained by us after we fulfilled our supply obligations pursuant to the supply agreement. The difference between fair value and the amounts paid for stock were also recorded as deferred revenue since this represented consideration provided by Gintech as part of the supply agreement. Throughout the term of the supply agreement, we have amortized a portion of the deferred revenue into revenue based on actual quantities delivered. As part of the settlement, Gintech agreed that we would retain $21.9 million of the non-refundable deposit without recourse. In relation to the settlement, we recognized $22.0 million of revenue in the third quarter of 2013 representing a portion of the unamortized non-refundable deposit and a portion of the unamortized difference between fair value and the amounts paid for the stock. The remaining $0.9 million of deferred revenue will be recognized when we complete our remaining performance commitments that are scheduled to be completed by December 31, 2013. Pursuant to the termination agreement, the remaining $35.1 million refundable deposit will be repaid to Gintech over time with payments beginning December 31, 2013 and continuing each quarter through June 30, 2016.

	On March 29, 2013, we amended a long-term solar wafer supply agreement with Tainergy Tech Co., LTD ("Tainergy"). Under the terms of the supply agreement, we were to supply solar grade silicon wafers over a ten-year period at pre-determined pricing for certain volumes on a take-or-pay basis. Tainergy had advanced funds to us in the form of both refundable and non-refundable deposits pursuant to the agreement. Tainergy did not meet its purchase obligations pursuant to the supply agreement and agreed to settle the purchase shortfalls for the first four contract years. As part of the settlement, Tainergy agreed that we would deduct and retain $25.0 million of the refundable capacity reservation deposit without recourse and as a result, we recognized $25.0 million as revenue in the first quarter of 2013. In addition to the settlement of purchase shortfalls for the first four contract years, we agreed to significantly reduce required minimum purchase volumes in the remaining six contract years, as well as to modify the pricing terms to be based on market rates similar to other SunEdison long-term solar wafer supply agreements. The remaining deposit will be refunded ratably as purchases are made over the remaining six contract years. The forfeiture of the deposit of $25.0 million, which was previously reflected as a liability, has been reflected as cash provided by operating activities and cash used in financing activities in the condensed consolidated statement of cash flows.

	On September 25, 2012, we agreed to terminate a long-term solar wafer supply agreement with Conergy AG. Under the terms of the supply agreement, we were to supply solar grade silicon wafers over a ten-year period at pre-determined pricing for certain volumes on a take-or-pay basis. Conergy had advanced funds to us in the form of both refundable and non-refundable deposits pursuant to the agreement. As part of the termination agreement with Conergy, we returned $21.3 million of the deposits and collected $26.7 million. In addition, Conergy agreed to assign to us certain operations and maintenance service agreements for solar projects in Germany, Italy and Spain or, if agreement could not be reached on those assignments, Conergy agreed to pay us $3.0 million in cash. This assignment was subject to our due diligence. We recognized $37.1 million as revenue at September 30, 2012 due to the fact we were relieved of our future performance obligations under the agreement. The retention of the deposit, which was previously reflected as a liability, in satisfaction of the take or pay requirement has been classified as an operating cash inflow in the condensed consolidated statement of cash flows. During the third quarter of 2013, pursuant to the terms of the termination agreement, we completed the due diligence period and elected not to take any operation and maintenance service agreements from Conergy and instead elected to receive the $3.0 million in cash, of which $2.0 million was collected in October 2013 with the remainder to be collected by December 31, 2013. There was no impact to the condensed consolidated statements of operations as a result of this election.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Samsung Fine Chemicals Joint Venture
	In February 2011, we entered into a joint venture with Samsung Fine Chemicals Co. Ltd. through our wholly owned subsidiary, MEMC Singapore Pte. Ltd. (now known as SunEdison Products Singapore Pte. Ltd), for the construction and operation of a new facility to produce high purity polysilicon in Ulsan, South Korea (the "SMP JV"). The SMP JV will manufacture and supply polysilicon to SunEdison and to international markets through SunEdison Singapore. Our ownership interest in the joint venture is 50% and Samsung Fine Chemicals Co. Ltd. owns the other 50%.

	In September 2011, we executed a Supply and License Agreement with the SMP JV under which SunEdison will license and sell to the joint venture fluid-bed reactor (FBR) technology and related equipment used for producing polysilicon. We will receive proceeds under the Supply and License Agreement based on certain milestones being achieved throughout the construction, installation and testing of the equipment. Proceeds received from the SMP JV under the Supply and License Agreement will be recorded as a reduction in our basis in the SMP JV investment, and to the extent that our basis in the investment is zero, the remaining proceeds received will be recorded as a liability. To the extent the total cash proceeds received exceed the sum of our cost basis in the equipment plus our capital contributions to the SMP JV, and when we have no remaining performance obligations, a gain will be recognized.

	During the nine month period ended September 30, 2013, we made equity contributions of $40.6 million under the Supply and License Agreement. In total, we have made $96.9 million in equity contributions to the SMP JV. Since inception of the SMP JV, the deposits received from Samsung under the Supply and License Agreement have exceeded our investment, and we recorded this as a reduction in our equity investment balance, with the excess of $60.2 million recorded in long-term customer and other deposits. The cash received is recorded as an investing inflow within the condensed consolidated statement of cash flows. As of September 30, 2013, our investment balance in the SMP JV was zero. Our total cash commitments, inclusive of the $96.9 million invested thus far, are expected to be approximately $175.0 million through the first half of 2014. We expect our remaining cash commitments to be substantially offset by proceeds to be received under the Supply and License Agreement.

	Purchase Obligations

	We maintain long-term agreements with multiple suppliers in connection with the purchase of certain raw materials and long-term agreements with multiple subcontractors to manufacture solar wafers for us.
	As part of our 2011 Global Plan, we provided notice to several of our vendors with whom we had long-term supply contracts that we would no longer be fulfilling our purchase obligations. In connection with the restructuring, we recorded significant restructuring liabilities associated with the estimated settlements arising from these actions based on management's best estimates of the ultimate outcome of these contract resolutions at that time. As of September 30, 2013, we have recorded total liabilities of $40.1 million associated with the estimated settlements arising from these purchase obligations with multiple vendors, $9.7 million of which is recorded to short-term accrued liabilities and $30.4 million is recorded as long-term other liabilities in our condensed consolidated balance sheet. The amount accrued as of September 30, 2013 represents our best estimate of the probable amounts to settle all of our purchase obligations based on presently known information, which involve the use of assumptions requiring significant judgment. We estimate the range of reasonably possible losses to be up to approximately $166.0 million, inclusive of the Wacker claims as discussed below in the legal proceedings section. These estimates include the contractual terms of the agreements, including whether or not there are fixed volumes and/or fixed prices. In addition, under certain contracts, the counterparty may have a contractual obligation to sell the materials to mitigate their losses. We also included in our estimate of losses consideration around whether we believe the obligation will be settled through arbitration, litigation or commercially viable alternative resolutions or settlements. We intend to vigorously defend ourselves against any arbitration or litigation. Due to the inherent uncertainties of arbitration and litigation, we cannot predict the ultimate outcome or resolution of such actions. The actual amounts ultimately settled with these vendors could vary significantly, which could have a material adverse impact on our business, results of operations and financial condition.

	Contingent Consideration

	As of September 30, 2013, liabilities for contingent consideration were recorded and are outstanding in connection with acquisitions. The liability recognized under these arrangements was $50.4 million as of September 30, 2013, representing the estimated fair value of these obligations. Of the $50.4 million liability, $26.8 million is recorded as a short term liability in contingent consideration and $23.6 million is recorded as a long-term liability in other liabilities. The aggregate maximum payouts which could occur under these arrangements is $84.3 million in the form of cash and equity. Any future revisions to the fair value of the contingent consideration associated with business combinations outside of the measurement period, which could be material, will be recorded to the condensed consolidated statement of operations.
	Commitments
	Indemnifications
	We have agreed to indemnify certain customers against claims of infringement of the intellectual property rights of others in our sales contracts with these customers. Historically, we have not paid any claims under these indemnification obligations, and we do not have any pending indemnification claims as of September 30, 2013.
	We generally warrant the operation of our solar energy systems for a period of time. Certain parts and labor warranties from our vendors can be assigned to our customers. Due to the absence of historical material warranty claims and expected future claims, we have recorded an immaterial warranty accrual related to solar energy systems as of September 30, 2013. We may also indemnify our customers for tax credits and feed in tariffs associated with the systems we construct and then sell, including sale leasebacks. During the nine month period ended September 30, 2013, we did not make any material payments under the terms of the sale agreements to indemnify our customers for shortfalls in amounts approved by the U.S. Treasury Department related to the Grant in Lieu program tax credits. Based on current information, we are unable to estimate additional exposures to the indemnification of tax credits and feed in tariffs.

	In connection with certain contracts to sell solar energy systems directly or as sale-leasebacks, our SunEdison LLC subsidiary has guaranteed the systems' performance for various time periods following the date of interconnection. Also, under separate operations and maintenance services agreements, SunEdison LLC has guaranteed the uptime availability of the systems over the term of the arrangements, which may last up to 20 years. To the extent there are shortfalls in either of the guarantees, SunEdison LLC is required to indemnify the purchaser up to the guaranteed amount through a cash payment. The maximum losses that SunEdison LLC may be subject to for non-performance are contractually limited by the terms of each executed agreement.
	Legal Proceedings
	We are involved in various legal proceedings, claims, investigations and other legal matters which arise in the ordinary course of business. Although it is not possible to predict the outcome of these matters, we believe that the ultimate outcome of these proceedings, individually and in the aggregate, will not have a material adverse effect on our financial position, cash flows or results of operations.
	S.O.I.TEC Silicon on Insulator Technologies S.A. ("Soitec") v. SunEdison, Inc.
	On May 19, 2008, Soitec and Commissariat A L'Energie Atomique ("CEA") filed a complaint against the company in the U.S. District Court for the District of Delaware (Civil Action No. 08-292) alleging infringement, including willful infringement, by SunEdison of three U.S. patents related to silicon-on-insulator technology, and requested damages and an injunction. Soitec and CEA filed an amended complaint on July 21, 2009, adding a fourth, related patent to the lawsuit. SunEdison filed a counterclaim against Soitec for infringement of one of SunEdison's U.S. patents. The court bifurcated the case into two phases, a first liability phase, which, to the extent liability is found, will be followed by a second damages phase. In a memorandum opinion dated October 13, 2010, the court found that all of SunEdison's current products and processes do not infringe any valid claim of the four asserted Soitec patents.

	The court held a jury trial from October 25, 2010 to November 2, 2010. After the court's October 13, 2010 ruling in favor of SunEdison, the only remaining claim that Soitec continued to assert at trial was a single patent claim directed against some mono-implant research and development efforts conducted by SunEdison approximately six to eight years ago, none of which have occurred since 2006, and none of which are material or relevant to the current operations at SunEdison. SunEdison continued to assert at trial its counterclaim for infringement of SunEdison's patent. On November 2, 2010, the jury found that certain of Soitec's wafers infringed the patent asserted by SunEdison at trial. The jury also found that one of the Soitec patent claims was valid. This single patent claim covers SunEdison's mono-implant research and development efforts that ended in 2006. On July 13, 2011, the court denied all post trial motions. Soitec subsequently filed an appeal and SunEdison filed a cross-appeal. The appeal is now fully briefed in the U.S. Court of Appeals for the Federal Circuit. The appeal was stayed pending en banc review of a jurisdictional question unrelated to the merits of the appeal. The stay has now been lifted and the case will be heard by the Court of Appeals later this year. The damages phase of this trial will occur, if at all, after the appeal. We believe that Soitec and CEA's suit against us has no merit, and we are asserting a vigorous defense, as well as the infringement counterclaim. Although it is not possible to predict the outcome of such matters, we believe that the ultimate outcome of this proceeding will not have a material adverse effect on our financial position, cash flows or results of operations.
	Jerry Jones v. SunEdison, Inc., et al.
	On December 26, 2008, a putative class action lawsuit was filed in the U.S. District Court for the Eastern District of Missouri by plaintiff, Jerry Jones, purportedly on behalf of all participants in and beneficiaries of SunEdison's 401(k) Savings Plan (the "Plan") between September 4, 2007 and December 26, 2008, inclusive. The complaint asserted claims against SunEdison and certain of its directors, employees and/or other unnamed fiduciaries of the Plan. The complaint alleges that the defendants breached certain fiduciary duties owed under the Employee Retirement Income Security Act, generally asserting that the defendants failed to make full disclosure to the Plan's participants of the risks of investing in SunEdison's stock and that the company's stock should not have been made available as an investment alternative in the Plan. The complaint also alleges that SunEdison failed to disclose certain material facts regarding SunEdison's operations and performance, which had the effect of artificially inflating SunEdison's stock price.

	On June 1, 2009, an amended class action complaint was filed by Mr. Jones and another purported participant of the Plan, Manuel Acosta, which raises substantially the same claims and is based on substantially the same allegations as the original complaint. However, the amended complaint changes the period of time covered by the action, purporting to be brought on behalf of beneficiaries of and/or participants in the Plan from June 13, 2008 through the present, inclusive. The amended complaint seeks unspecified monetary damages, including losses the participants and beneficiaries of the Plan allegedly experienced due to their investment through the Plan in SunEdison's stock, equitable relief and an award of attorney's fees. No class has been certified and discovery has not begun. The company and the named directors and employees filed a motion to dismiss the complaint, which was fully briefed by the parties as of October 9, 2009. The parties each subsequently filed notices of supplemental authority and corresponding responses. On March 17, 2010, the court denied the motion to dismiss. The SunEdison defendants filed a motion for reconsideration or, in the alternative, certification for interlocutory appeal, which was fully briefed by the parties as of June 16, 2010. The parties each subsequently filed notices of supplemental authority and corresponding responses. On October 18, 2010, the court granted the SunEdison defendants' motion for reconsideration, vacated its order denying the SunEdison defendants' motion to dismiss, and stated that it will revisit the issues raised in the motion to dismiss after the parties supplement their arguments relating thereto. Both parties filed briefs supplementing their arguments on November 1, 2010. On June 28, 2011, plaintiff Jerry Jones filed a notice of voluntary withdrawal from the action. On June 29, 2011, the Court entered an order withdrawing Jones as one of the plaintiffs in this action. The parties each have continued to file additional notices of supplemental authority and responses thereto. On September 27, 2012, the SunEdison defendants moved for oral argument on their pending motion to dismiss; plaintiff Manuel Acosta joined in the SunEdison defendants' motion for oral argument on October 9, 2012. The Court has not ruled on this motion for oral argument.
	SunEdison believes the above class action is without merit, and we will assert a vigorous defense. Due to the inherent uncertainties of litigation, we cannot predict the ultimate outcome or resolution of the foregoing class action proceedings or estimate the amounts of, or potential range of, loss with respect to these proceedings. An unfavorable outcome is not expected to have a material adverse impact on our business, results of operations and financial condition. We have indemnification agreements with each of our present and former directors and officers, under which we are generally required to indemnify each such director or officer against expenses, including attorney's fees, judgments, fines and settlements, arising from actions such as the lawsuits described above (subject to certain exceptions, as described in the indemnification agreements).

	Wacker Chemie AG v. SunEdison, Inc.

	On December 20, 2012, Wacker Chemie AG (“Wacker”) filed a notice of arbitration with the Swiss Chambers’ Arbitration Institution (the “SCAI”) against the company, requesting the resolution of a dispute arising from two agreements and a subsequent settlement agreement entered into between Wacker and the company. Following a hearing before the Arbitral Tribunal where procedural matters were established by the SCAI pursuant to the parties’ agreement, on September 27, 2013, Wacker filed a complete statement of claim. In the statement of claim, Wacker alleges that the company failed to comply with its contractual obligations, in particular that the company failed to take or pay for certain quantities of polycrystalline silicon as required under the settlement agreement. Wacker claims a payment of 22.8 million Euro plus interest for the payment of outstanding invoices and an amount of 68.6 million Euro for damages it claims as a result of the alleged breach by the company through August 2013, and an amount of approximately 23.6 million Euro (yet to be determined) for damages it claims as a result of the alleged breach by the company for the months of September, October, November and December 2013, plus interest thereon. These amounts are included in the estimated range of reasonably possible losses as discussed above in the purchase obligations section. The company intends to vigorously defend this action and will file, pursuant to the procedural timetable, a complete statement of defense on or before December 27, 2013.

	From time to time, we may conclude it is in the best interests of our stockholders, employees, vendors and customers to settle one or more litigation matters, and any such settlement could include substantial payments; however, other than as may be noted above, we have not reached this conclusion with respect to any particular matter at this time. There are a variety of factors that influence our decision to settle any particular individual matter, and the amount we may choose to pay or accept as payment to settle such matters, including the strength of our case, developments in the litigation (both expected and unexpected), the behavior of other interested parties, including non-parties to the matter, the demand on management time and the possible distraction of our employees associated with the case and/or the possibility that we may be subject to an injunction or other equitable remedy. It is difficult to predict whether a settlement is possible, the amount of an appropriate settlement or when is the opportune time to settle a matter in light of the numerous factors that go into the settlement decision.

Reportable_Segments

Reportable Segments	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Reportable Segments	'
	Reportable Segments
	We are organized by end market, with two business segments: Semiconductor Materials and Solar Energy.


		Three Months Ended						Nine Months Ended September 30,
		September 30,
	In millions	2013			2012			2013			2012
	Net sales:
	Semiconductor Materials	$	230.7		$	240.3		$	699.5		$	689

	Solar Energy	380.8			361.3			756.9			1,240.20

	Consolidated net sales	$	611.5		$	601.6		$	1,456.40		$	1,929.20

	Operating income (loss):
	Semiconductor Materials	$	(0.8	)	$	8.7		$	4.2		$	(8.1	)

	Solar Energy	(17.3		)	75.8			(53.3		)	70.4

	Corporate and Other	(31.0		)	(25.6		)	(80.1		)	(72.9		)
	Consolidated operating (loss) income	$	(49.1	)	$	58.9		$	(129.2	)	$	(10.6	)

	Interest (income) expense:
	Semiconductor Materials	$	—		$	(0.3	)	$	(0.9	)	$	(0.8	)

	Solar Energy	25.1			14.7			67			60.7

	Corporate and Other	20.1			13.6			61.2			40.4

	Consolidated interest expense	$	45.2		$	28		$	127.3		$	100.3

	Depreciation and amortization:
	Semiconductor Materials	$	29.4		$	30.6		$	90.4		$	92.6

	Solar Energy	38.7			26.5			95.7			70.5

	Corporate and Other	2.5			2			6.3			5.3

	Consolidated depreciation and amortization	$	70.6		$	59.1		$	192.4		$	168.4

	Capital expenditures:
	Semiconductor Materials	$	17.2		$	14.6		$	65.8		$	55.6

	Solar Energy (1)	150.4			44.9			291.3			231.3

	Corporate and Other	2.8			—			5.4			6.6

	Consolidated capital expenditures	$	170.4		$	59.5		$	362.5		$	293.5

	__________________________

	-1	Includes construction of solar energy systems of $138.8 million and $35.5 million in the three month periods ended September 30, 2013 and 2012, respectively, and construction of solar energy systems of $261.3 million and $193.2 million in the nine month periods ended September 30, 2013 and 2012, respectively.
	Solar Energy

	On September 30, 2013, we entered into a termination agreement with Gintech, terminating our solar wafer supply agreement, and recognized $22.0 million of revenue related to that termination in the three month period ended September 30, 2013. See Note 13.

	During the nine month period ended September 30, 2013, we recognized revenue of $25.0 million as a result of the amendment of the Tainergy long-term solar wafer supply agreement. See Note 13.

	On September 25, 2012, we entered into a termination agreement with Conergy, terminating our solar wafer supply agreement, and recognized $37.1 million of revenue related to that termination in the three month period ended September 30, 2012. See Note 13.
	We incurred tangible asset impairment charges of $14.2 million and $17.3 million on solar wafering assets during the three and nine month periods ended September 30, 2012, respectively. It was determined that the related assets had no future service potential.

	On September 4, 2012, we settled disputes with Evonik arising from our early termination of two supply agreements. As part of this settlement, we recognized $69.2 million of operating income in the three month period ended September 30, 2012. See Note 2.

IPO_of_SSL_Notes

IPO of SSL (Notes)	9 Months Ended
IPO of SSL (Notes)	Sep. 30, 2013
Proposed IPO SSL [Abstract]	'
Proposed IPO SSL [Text Block]	'
	Proposed Initial Public Offering of Semiconductor Business

	On August 22, 2013, we announced our plan to pursue an initial public offering (the “ Semiconductor Offering”) of our semiconductor business through a newly formed company to be known as SunEdison Semiconductor, Ltd., and in connection therewith, filed a registration statement with respect to such proposed Semiconductor Offering with the SEC on September 9, 2013. We plan to sell a minority ownership interest in the semiconductor business to the public. We have deferred all incremental costs directly attributable to this offering and will charge those costs against the gross proceeds of the offering as a reduction of SunEdison Semiconductor, Ltd.'s additional paid-in capital. Any incremental costs not directly attributable to the Semiconductor Offering will be expensed as incurred. The incremental costs are not material to our financial statements.

	The completion of the proposed Semiconductor Offering is subject to market conditions and a final decision regarding the amount of interest to be sold to the public at the time of the offering will be determined by our Board of Directors at a date to be determined. Completion of the Semiconductor Offering and related items are subject to certain customary conditions, including approval by our Board of Directors of the final terms of the offering, receipt of all regulatory approvals, including the effectiveness of the registration statement filed with the SEC on September 9, 2013, including any subsequent amendments.

Condensed_Consolidating_Financ

Condensed Consolidating Financial Information	9 Months Ended
	Sep. 30, 2013
Condensed Financial Statements, Captions [Line Items]	'
Condensed Consolidating Financial Information Disclosure [Text Block]	'
	Unaudited Condensed Consolidating Financial Information
	On March 10, 2011, we issued $550.0 million of 7.75% Senior Notes due April 1, 2019. The 2019 Notes are fully and unconditionally guaranteed on a joint and several senior unsecured basis by certain wholly owned domestic subsidiaries of the company (the "Guarantor Subsidiaries"). The following condensed consolidating financial information, which has been prepared in accordance with the requirements for presentation of Rule 3-10(d) of Regulation S-X promulgated under the Securities Act, presents the required unaudited condensed consolidating financial information.

	Unaudited Condensed Consolidating Statement of Operations
	For the Three Months Ended September 30, 2013
	(In millions)



		SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
	Net sales	$	193.9			$	224.8			$	952.5			$	(759.7	)		$	611.5

	Cost of goods sold	208.1				221.4				778.5				(657.1		)		550.9

	Gross profit	(14.2		)		3.4				174				(102.6		)		60.6

	Operating expenses:
	Marketing and administration	30.2				23				37.9				—				91.1

	Research and development	12.7				3.5				2.4				—				18.6

	Restructuring and impairment (reversals) charges	0.5				0.3				(0.8		)		—				—

	Operating (loss) income	(57.6		)		(23.4		)		134.5				(102.6		)		(49.1		)

	Non-operating expense (income):
	Interest expense	22.1				5.5				17.6				—				45.2

	Interest income	—				—				(0.7		)		—				(0.7		)

	Other, net	(12.3		)		6.3				11.5				—				5.5

	Total non-operating expense	9.8				11.8				28.4				—				50

	(Loss) income before income taxes, investment in subsidiary (loss) income and equity in loss of joint ventures	(67.4		)		(35.2		)		106.1				(102.6		)		(99.1		)

	Income tax (benefit) expense	(161.0		)		155.1				22.8				0.2				17.1

	Income (loss) before investment in subsidiary income (loss) and equity in income (loss) of joint ventures	93.6				(190.3		)		83.3				(102.8		)		(116.2		)

	Investment in subsidiary (loss) income	(201.6		)		(83.5		)		—				285.1				—

	Equity in income of joint ventures, net of tax	—				—				4.1				—				4.1

	Net (loss) income	(108.0		)		(273.8		)		87.4				182.3				(112.1		)

	Net (income) loss attributable to noncontrolling interests	—				(0.5		)		4.6				—				4.1

	Net (loss) income attributable to SunEdison stockholders	$	(108.0	)		$	(274.3	)		$	92			$	182.3			$	(108.0	)

















Unaudited Condensed Consolidating Statement of Operations
For the Three Months Ended September 30, 2012
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
Net sales	$	189.7			$	375.9			$	667.2			$	(631.2	)		$	601.6

Cost of goods sold	204.1				410.9				577.2				(677.5		)		514.7

Gross profit	(14.4		)		(35.0		)		90				46.3				86.9

Operating expenses:
Marketing and administration	26.3				14.3				28.3				—				68.9

Research and development	11.9				3.7				1.8				—				17.4

Restructuring and impairment (reversals) charges	16.2				(1.1		)		(73.4		)		—				(58.3		)

Operating (loss) income	(68.8		)		(51.9		)		133.3				46.3				58.9

Non-operating expense (income):
Interest expense	12.4				—				15.6				—				28

Interest income	—				—				(0.9		)		—				(0.9		)

Other, net	(11.0		)		17.7				(10.8		)		1.7				(2.4		)

Total non-operating expense	1.4				17.7				3.9				1.7				24.7

(Loss) income before income taxes, investment in subsidiary (loss) income and equity in loss of joint ventures	(70.2		)		(69.6		)		129.4				44.6				34.2

Income tax (benefit) expense	(22.2		)		(4.6		)		24.8				(1.3		)		(3.3		)

(Loss) income before investment in subsidiary (loss) income and equity in loss of joint ventures	(48.0		)		(65.0		)		104.6				45.9				37.5

Investment in subsidiary income (loss)	85				80.6				—				(165.6		)		—

Equity in loss of joint ventures, net of tax	—				—				0.9				—				0.9

Net income (loss)	37				15.6				105.5				(119.7		)		38.4

Net income attributable to noncontrolling interests	—				(0.4		)		(1.0		)		—				(1.4		)

Net income (loss) attributable to SunEdison stockholders	$	37			$	15.2			$	104.5			$	(119.7	)		$	37













Unaudited Condensed Consolidating Statement of Operations
For the Nine Months Ended September 30, 2013
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
Net sales	$	580.8			$	385.2			$	2,262.90			$	(1,772.5	)		$	1,456.40

Cost of goods sold	625.9				377.4				2,005.40				(1,711.8		)		1,296.90

Gross profit	(45.1		)		7.8				257.5				(60.7		)		159.5

Operating expenses:
Marketing and administration	84.9				62.5				92.8				—				240.2

Research and development	36.4				9.9				7.8				—				54.1

Restructuring and impairment (reversals) charges	1.5				0.3				(7.4		)		—				(5.6		)

Operating (loss) income	(167.9		)		(64.9		)		164.3				(60.7		)		(129.2		)

Non-operating expense (income):
Interest expense	61.8				13.1				52.4				—				127.3

Interest income	—				—				(2.0		)		—				(2.0		)

Other, net	(24.1		)		0.3				32.8				—				9

Total non-operating expense	37.7				13.4				83.2				—				134.3

(Loss) income before income taxes, investment in subsidiary (loss) income and equity in loss of joint ventures	(205.6		)		(78.3		)		81.1				(60.7		)		(263.5		)

Income tax (benefit) expense	(225.6		)		204.6				70				1.2				50.2

Income (loss) before investment in subsidiary (loss) income and equity in loss of joint ventures	20				(282.9		)		11.1				(61.9		)		(313.7		)

Investment in subsidiary (loss) income	(320.3		)		(191.2		)		—				511.5				—

Equity in loss of joint ventures, net of tax	—				—				3.8				—				3.8

Net (loss) income	(300.3		)		(474.1		)		14.9				449.6				(309.9		)

Net (income) loss attributable to noncontrolling interests	—				(0.8		)		10.4				—				9.6

Net (loss) income attributable to SunEdison stockholders	$	(300.3	)		$	(474.9	)		$	25.3			$	449.6			$	(300.3	)


Unaudited Condensed Consolidating Statement of Operations
For the Nine Months Ended September 30, 2012
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
Net sales	$	545.1			$	705.5			$	2,288.70			$	(1,610.1	)		$	1,929.20

Cost of goods sold	586.2				741.3				2,020.00				(1,645.7		)		1,701.80

Gross profit	(41.1		)		(35.8		)		268.7				35.6				227.4

Operating expenses:
Marketing and administration	87.6				66.8				80.8				—				235.2

Research and development	37.5				11.3				7				—				55.8

Restructuring and impairment (reversals) charges	15.4				2.9				(71.3		)		—				(53.0		)

Operating (loss) income	(181.6		)		(116.8		)		252.2				35.6				(10.6		)

Non-operating expense (income):
Interest expense	35.8				6.1				58.4				—				100.3

Interest income	(0.1		)		—				(2.7		)		—				(2.8		)

Other, net	(39.4		)		17.1				14.6				7.8				0.1

Total non-operating (income) expense	(3.7		)		23.2				70.3				7.8				97.6

(Loss) income before income taxes, investment in subsidiary (loss) income and equity in loss of joint ventures	(177.9		)		(140.0		)		181.9				27.8				(108.2		)

Income tax (benefit) expense	(68.9		)		60.9				35.9				—				27.9

(Loss) income before investment in subsidiary (loss) income and equity in loss of joint ventures	(109.0		)		(200.9		)		146				27.8				(136.1		)

Investment in subsidiary (loss) income	(29.8		)		6.9				—				22.9				—

Equity in loss of joint ventures, net of tax	—				—				(0.9		)		—				(0.9		)

Net (loss) income	(138.8		)		(194.0		)		145.1				50.7				(137.0		)

Net income attributable to noncontrolling interests	—				(0.8		)		(1.0		)		—				(1.8		)

Net (loss) income attributable to SunEdison stockholders	$	(138.8	)		$	(194.8	)		$	144.1			$	50.7			$	(138.8	)


Unaudited Condensed Consolidating Statement of Comprehensive Loss
Three Months Ended September 30, 2013
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
Net (loss) income	$	(108.0	)		$	(273.8	)		$	87.4			$	182.3			$	(112.1	)

Other comprehensive income (loss), net of tax:
Net foreign currency translation adjustment	—				—				13.7				—				13.7

Net unrealized gain (loss) on available-for-sale securities	—				—				0.8				—				0.8

Unrealized gain on hedging instruments	0.5				—				9.2				—				9.7

Actuarial gain (loss) and amortization of prior service cost	1.9				—				—				—				1.9

Other comprehensive loss, before reclassifications	2.4				—				23.7				—				26.1

Amounts reclassified out of AOCI(1)	—				—				—				—				—

Other comprehensive income, net of tax	2.4				—				23.7				—				26.1

Total comprehensive (loss) income	$	(105.6	)		$	(273.8	)		$	111.1			$	182.3			$	(86.0	)

Net income attributable to noncontrolling interests	—				(0.5		)		4.6				—				4.1

Net foreign currency translation adjustment attributable to noncontrolling interests	—				—				(4.8		)		—				(4.8		)

Comprehensive (loss) income attributable to SunEdison stockholders	$	(105.6	)		$	(274.3	)		$	110.9			$	182.3			$	(86.7	)


(1) Amounts reclassified out of AOCI relate to settlements of hedging instruments and are recognized in interest expense in the condensed consolidating statement of operations. See Note 10.

Unaudited Condensed Consolidating Statement of Comprehensive Loss
Three Months Ended September 30, 2012
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
Net income (loss)	$	37			$	15.6			$	105.5			$	(119.7	)		$	38.4

Other comprehensive income (loss), net of tax:
Net foreign currency translation adjustment	—				—				13.5				—				13.5

Net unrealized loss on available-for-sale securities	—				—				(2.8		)		—				(2.8		)

Unrealized loss on hedging instruments	—				—				(0.7		)		—				(0.7		)

Actuarial gain (loss) and amortization of prior service cost	0.2				—				—				—				0.2

Other comprehensive income, net of tax	0.2				—				10				—				10.2

Total comprehensive income (loss)	$	37.2			$	15.6			$	115.5			$	(119.7	)		$	48.6

Net income attributable to noncontrolling interests	—				(0.4		)		(1.0		)		—				(1.4		)

Net translation adjustment attributable to noncontrolling interests	—				—				(1.1		)		—				(1.1		)

Comprehensive income (loss) attributable to SunEdison stockholders	$	37.2			$	15.2			$	113.4			$	(119.7	)		$	46.1




Unaudited Condensed Consolidating Statement of Comprehensive Loss
Nine Months Ended September 30, 2013
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
Net (loss) income	$	(300.3	)		$	(474.1	)		$	14.9			$	449.6			$	(309.9	)

Other comprehensive (loss) income, net of tax:
Net foreign currency translation adjustment	—				—				(38.7		)		—				(38.7		)

Net unrealized gain on available-for-sale securities	—				—				0.9				—				0.9

Unrealized gain (loss) on hedging instruments	0.1				—				(5.5		)		—				(5.4		)

Actuarial gain (loss) and amortization of prior service cost	1.9				—				—				—				1.9

Other comprehensive income (loss), before reclassifications	2				—				(43.3		)		—				(41.3		)

Amounts reclassified out of AOCI(1)	—				—				(0.4		)		—				(0.4		)

Other comprehensive income (loss), net of tax	2				—				(43.7		)		—				(41.7		)

Total comprehensive (loss) income	$	(298.3	)		$	(474.1	)		$	(28.8	)		$	449.6			$	(351.6	)

Net loss (income) attributable to noncontrolling interests	—				(0.8		)		10.4				—				9.6

Net foreign currency translation adjustment attributable to noncontrolling interests	—				—				(2.2		)		—				(2.2		)

Comprehensive (loss) income attributable to SunEdison stockholders	$	(298.3	)		$	(474.9	)		$	(20.6	)		$	449.6			$	(344.2	)


(1) Amounts reclassified out of AOCI relate to settlements of hedging instruments and are recognized in interest expense in the condensed consolidating statement of operations. See Note 10.



Unaudited Condensed Consolidating Statement of Comprehensive Loss
Nine Months Ended September 30, 2012
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
Net (loss) income	$	(138.8	)		$	(194.0	)		$	145.1			$	50.7			$	(137.0	)

Other comprehensive (loss) income, net of tax:
Net foreign currency translation adjustment	—				—				2.7				—				2.7

Net unrealized loss on available-for-sale securities	—				—				(1.5		)		—				(1.5		)

Unrealized loss on hedging instruments	—				—				(0.8		)		—				(0.8		)

Actuarial gain (loss) and amortization of prior service cost	1.6				—				(10.5		)		—				(8.9		)

Other comprehensive income (loss), net of tax	1.6				—				(10.1		)		—				(8.5		)

Total comprehensive (loss) income	$	(137.2	)		$	(194.0	)		$	135			$	50.7			$	(145.5	)

Net income attributable to noncontrolling interests	—				(0.8		)		(1.0		)		—				(1.8		)

Net translation adjustment attributable to noncontrolling interests	—				—				(1.0		)		—				(1.0		)

Comprehensive (loss) income attributable to SunEdison stockholders	$	(137.2	)		$	(194.8	)		$	133			$	50.7			$	(148.3	)





Unaudited Condensed Consolidating Balance Sheet
September 30, 2013
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
ASSETS
Current assets:
Cash and cash equivalents	$	131.5			$	99.3			$	409.5			$	—			$	640.3

Restricted cash	—				1.8				115.3				—				117.1

Accounts receivable, net	59.8				29.8				245.7				—				335.3

Inventories	22.8				22.8				191.1				(28.9		)		207.8

Solar energy systems held for development and sale	—				—				410.6				(53.9		)		356.7

Prepaid expenses and other current assets	29.7				49.7				166.7				—				246.1

Total current assets	243.8				203.4				1,538.90				(82.8		)		1,903.30

Investments in subsidiaries	110.2				69.3				—				(179.5		)		—

Property, plant and equipment, net:
Non-solar energy systems, net	65				282.7				853				(48.9		)		1,151.80

Solar energy systems, net	—				1.2				1,812.20				71.5				1,884.90

Restricted cash	—				1.7				57.3				—				59

Other assets	82.1				58.4				425.5				—				566

Total assets	$	501.1			$	616.7			$	4,686.90			$	(239.7	)		$	5,565.00



Unaudited Condensed Consolidating Balance Sheet
September 30, 2013
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Current portion of long-term debt and short term borrowing	$	—			$	—			$	19.7			$	—			$	19.7

Short-term solar energy system financing and capital lease obligations	—				0.2				261.4				—				261.6

Accounts payable	26.2				23.2				618.1				—				667.5

Accrued liabilities	17.9				112.6				278.1				—				408.6

Contingent consideration payable related to acquisitions	—				26.8				—				—				26.8

Deferred revenue for solar energy systems	—				27.3				92.9				—				120.2

Customer and other deposits	7.6				0.5				26.7				—				34.8

Intercompany (receivable) payable and short-term notes	(907.1		)		989.3				(82.2		)		—				—

Total current liabilities	(855.4		)		1,179.90				1,214.70				—				1,539.20

Long-term debt, less current portion	746.6				—				9.5				—				756.1

Long-term solar energy system financing and capital lease obligations, less current portion	—				9.7				2,071.20				—				2,080.90

Customer and other deposits	156.3				—				9.1				—				165.4

Deferred revenue for solar energy systems	—				30.1				71.6				—				101.7

Non-solar energy system deferred revenue	—				—				3.5				—				3.5

Long-term intercompany notes (receivable) payable	(68.4		)		(94.5		)		162.9				—				—

Other liabilities	35				10.4				289.3				—				334.7

Total liabilities	14.1				1,135.60				3,831.80				—				4,981.50

Redeemable noncontrolling interests	—				—				—				—				—

Total SunEdison stockholders’ equity	487				(519.5		)		759.2				(239.7		)		487

Noncontrolling interests	—				0.6				95.9				—				96.5

Total stockholders’ equity	487				(518.9		)		855.1				(239.7		)		583.5

Total liabilities and stockholders’ equity	$	501.1			$	616.7			$	4,686.90			$	(239.7	)		$	5,565.00



Unaudited Condensed Consolidating Balance Sheet
December 31, 2012
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
ASSETS
Current assets:
Cash and cash equivalents	$	65.1			$	60			$	447.5			$	—			$	572.6

Restricted cash	—				—				72.4				—				72.4

Accounts receivable, net	62				23.7				134.7				—				220.4

Inventories	18.4				70.6				200				(41.2		)		247.8

Solar energy systems held for development and sale	—				0.3				213.7				(80.2		)		133.8

Prepaid expenses and other current assets	24.9				40.1				147.4				—				212.4

Total current assets	170.4				194.7				1,215.70				(121.4		)		1,459.40

Investments in subsidiaries	498.2				564.2				—				(1,062.4		)		—

Property, plant and equipment, net:
Non-solar energy systems, net	57.2				294.4				913.8				(52.3		)		1,213.10

Solar energy systems, net	—				3				1,361.30				95.6				1,459.90

Restricted cash	—				1.7				48.5				—				50.2

Other assets	36.7				175.3				350.7				—				562.7

Total assets	$	762.5			$	1,233.30			$	3,890.00			$	(1,140.5	)		$	4,745.30



Unaudited Condensed Consolidating Balance Sheet
December 31, 2012
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Current portion of long-term debt and short term borrowing	$	—			$	—			$	3.4			$	—			$	3.4

Short-term solar energy system financing and capital lease obligations	—				0.2				97.6				—				97.8

Accounts payable	11.9				67				398.1				—				477

Accrued liabilities	32.8				42.5				267.7				—				343

Contingent consideration payable related to acquisitions	—				23.1				—				—				23.1

Deferred revenue for solar energy systems	—				40.7				72.4				—				113.1

Customer and other deposits	10.9				0.4				65.9				—				77.2

Intercompany (receivable) payable and short-term notes	(651.0		)		764.3				(113.3		)		—				—

Total current liabilities	(595.4		)		938.2				791.8				—				1,134.60

Long-term debt, less current portion	746.1				—				12.6				—				758.7

Long-term solar energy system financing and capital lease obligations, less current portion	—				9.8				1,498.60				—				1,508.40

Customer and other deposits	87.8				—				96.7				—				184.5

Deferred revenue for solar energy systems	—				45.8				100.2				—				146

Non-solar energy system deferred revenue	—				—				29.2				—				29.2

Long-term intercompany notes (receivable) payable	(45.4		)		(96.2		)		141.6				—				—

Other liabilities	(5.9		)		112				200.4				—				306.5

Total liabilities	187.2				1,009.60				2,871.10				—				4,067.90

Redeemable noncontrolling interests	—				—				11.3				—				11.3

Total SunEdison stockholders’ equity	575.3				223.7				916.8				(1,140.5		)		575.3

Noncontrolling interests	—				—				90.8				—				90.8

Total stockholders’ equity	575.3				223.7				1,007.60				(1,140.5		)		666.1

Total liabilities and stockholders’ equity	$	762.5			$	1,233.30			$	3,890.00			$	(1,140.5	)		$	4,745.30


Unaudited Condensed Consolidating Statement of Cash Flows
For the Nine Months Ended September 30, 2013
(In millions)


	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
Cash flows from operating activities:
Net cash (used in) provided by operating activities	$	(48.6	)		$	5.5			$	(431.7	)		$	167.2			$	(307.6	)

Cash flows from investing activities:
Capital expenditures	(11.4		)		(8.2		)		(81.6		)		—				(101.2		)

Construction of solar energy systems	—				—				(97.1		)		(164.2		)		(261.3		)

Purchases of cost and equity method investments	—				(1.5		)		(45.1		)		—				(46.6		)

Net proceeds from equity method investments	68.5				—				(0.1		)		—				68.4

Change in restricted cash	—				(0.5		)		(16.3		)		—				(16.8		)

Cash paid for acquisition, net of cash acquired	—				—				(7.3		)		—				(7.3		)

Receipts from vendors for deposits	—				—				0.6				—				0.6

Equity infusions or investments in subsidiaries	(66.8		)		(24.2		)		91				—				—

Other	0.7				(1.3		)		8.5				(3.0		)		4.9

Net cash used in investing activities	(9.0		)		(35.7		)		(147.4		)		(167.2		)		(359.3		)
Cash flows from financing activities:
Cash paid for contingent consideration for acquisitions	—				(0.8		)		—				—				(0.8		)

Proceeds from solar energy system financing and capital lease obligations	—				—				626.4				—				626.4

Repayments of solar energy system financing and capital lease obligations	—				(0.1		)		(64.3		)		—				(64.4		)

Net repayments of customer deposits related to long-term supply agreements	—				—				(51.7		)		—				(51.7		)

Principal payments on long term debt	—				—				(1.4		)		—				(1.4		)

Common stock issued and repurchased	239.6				—				—				—				239.6

Proceeds from noncontrolling interests	—				—				25.9				—				25.9

(Repayment) collection of intercompany debt	(115.0		)		70.4				44.6				—				—

Debt financing fees	—				—				(25.6		)		—				(25.6		)

Other	(0.6		)		—				(0.8		)		—				(1.4		)

Net cash provided by financing activities	124				69.5				553.1				—				746.6

Effect of exchange rate changes on cash and cash equivalents	—				—				(12.0		)		—				(12.0		)

Net increase (decrease) in cash and cash equivalents	66.4				39.3				(38.0		)		—				67.7

Cash and cash equivalents at beginning of period	65.1				60				447.5				—				572.6

Cash and cash equivalents at end of period	$	131.5			$	99.3			$	409.5			$	—			$	640.3






Unaudited Condensed Consolidating Statement of Cash Flows
For the Nine Months Ended September 30, 2012
(In millions)



	SunEdison, Inc.					Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
Cash flows from operating activities:
Net cash used in operating activities	$	(100.2	)			$	28.9			$	(152.5	)		$	(59.6	)		$	(283.4	)

Cash flows from investing activities:

Capital expenditures	(14.7		)			(16.3		)		(69.3		)		—				(100.3		)

Construction of solar energy systems	—					—				(243.3		)		50.1				(193.2		)

Purchases of cost and equity method investments	(3.8		)			—				(31.4		)		—				(35.2		)

Net proceeds from (used in) equity method investments	7.2					—				(4.2		)		—				3

Change in restricted cash	—					(2.1		)		0.8				—				(1.3		)

Equity infusions or investments in subsidiaries	(44.0		)			(6.7		)		50.7				—				—

Receipts to vendors for deposits and loans	—					—				4.8				—				4.8

Other	1.9					—				(11.5		)		9.5				(0.1		)

Net cash used in investing activities	(53.4		)			(25.1		)		(303.4		)		59.6				(322.3		)


Cash flows from financing activities:
Cash paid for contingent consideration for acquisitions	—					(3.8		)		(54.2		)		—				(58.0		)

Proceeds from solar energy system financing and capital lease obligations	—					8.4				711.9				—				720.3

Repayments of solar energy system financing and capital lease obligations	—					(0.5		)		(183.5		)		—				(184.0		)

Net repayments of customer deposits related to long-term supply agreements	—					—				(23.6		)		—				(23.6		)

Principal payments on long term debt	—					—				(1.8		)		—				(1.8		)

(Repayment) collection of intercompany debt	(33.8		)	—		9.5				24.3				—				—

Common stock issued and repurchased	(0.1		)			—				—				—				(0.1		)

Second lien term loans	196					—				—				—				196

Proceeds from noncontrolling interests	—					—				16.4				—				16.4

Debt financing fees	(12.7		)			—				(22.5		)		—				(35.2		)

Net cash provided by financing activities	149.4					13.6				467				—				630

Effect of exchange rate changes on cash and cash equivalents	(0.2		)			—				(0.1		)		—				(0.3		)

Net (decrease) increase in cash and cash equivalents	(4.4		)			17.4				11				—				24

Cash and cash equivalents at beginning of period	228.9					58.3				298.6				—				585.8

Cash and cash equivalents at end of period	224.5					75.7				309.6				—				$	609.8

Restructuring_and_Impairment_C1

Restructuring and Impairment Charges (Tables) (2011 Global Plan [Member])	9 Months Ended
	Sep. 30, 2013
2011 Global Plan [Member]	'
Restructuring Cost and Reserve [Line Items]	'
Details of Restructuring Expenses	'


																	As of September 30, 2013
	In millions	Accrued,		Year-to-Date			Cash			Non-Cash Settlements			Currency		Accrued September 30, 2013		Cumulative		Total Costs
		December 31, 2012		Restructuring			Payments										Costs		Expected to be Incurred
				(Reversals)Charges													Incurred
	Severance and other employee benefits	$	31.7	$	(2.0	)	$	(1.6	)	$	—		$	0.5	$	28.6	$	61.2	$	61.2

	Contract termination	134.5		(0.3		)	(59.7		)	(34.8		)	0.4		40.1		164.3		164.3

	Other	38.3		(5.3		)	(5.5		)	—			0.6		28.1		44.4		44.4

	Total	$	204.5	$	(7.6	)	$	(66.8	)	$	(34.8	)	$	1.5	$	96.8	$	269.9	$	269.9

Inventories_Tables

Inventories (Tables)	9 Months Ended
	Sep. 30, 2013
Inventory Disclosure [Abstract]	'
Inventories	'


		As of		As of
	In millions	September 30, 2013		December 31, 2012
	Raw materials and supplies	$	74.2	$	89.1

	Goods and work in process	81		109.1

	Finished goods	52.6		49.6

	Total inventories	$	207.8	$	247.8

Solar_Energy_Systems_Held_for_1

Solar Energy Systems Held for Development and Sale (Tables)	9 Months Ended
	Sep. 30, 2013
SES-HFD [Abstract]	'
Solar Energy Systems Held for Development and Sale [Table Text Block]	'
	Solar energy systems held for development and sale consist of the following:


		As of		As of
	In millions	September 30, 2013		December 31, 2012
	Under development	$	338.9	$	133.8

	Systems held for sale	17.8		—

	Total solar energy systems held for development and sale	$	356.7	$	133.8

Debt_and_Capital_Lease_Obligat1

Debt and Capital Lease Obligations (Tables)	9 Months Ended
	Sep. 30, 2013
Debt and Capital Lease Obligations [Abstract]	'
Debt	'


		As of September 30, 2013						As of December 31, 2012
		Total Principal		Current and Short-Term		Long-Term		Total Principal		Current and Short-Term		Long-Term
	In millions
	Non-solar energy system debt:
	Senior notes	$	550	$	—	$	550	$	550	$	—	$	550

	Second lien term loan	196.6		—		196.6		196.1		—		196.1

	Long-term notes and other	29.2		19.7		9.5		16		3.4		12.6

	Total non-solar energy system debt	$	775.8	$	19.7	$	756.1	$	762.1	$	3.4	$	758.7

	Solar energy system debt, financings and capital leaseback obligations:
	Short-term debt, weighted average interest rate of 7.24% and 6.47%, respectively	$	56.5	$	56.5	$	—	$	14.7	$	14.7	$	—

	System pre-construction, construction and term debt	858.8		185.1		673.7		271.3		61.3		210

	Capital leaseback obligations	136.8		7.1		129.7		93.3		7.5		85.8

	Financing leaseback obligations	1,169.60		12.9		1,156.70		1,107.20		14.3		1,092.90

	Other system financing transactions	120.8		—		120.8		119.7		—		119.7

	Total solar energy system debt, financings and capital leaseback obligations	$	2,342.50	$	261.6	$	2,080.90	$	1,606.20	$	97.8	$	1,508.40

	Total debt outstanding	$	3,118.30	$	281.3	$	2,837.00	$	2,368.30	$	101.2	$	2,267.10

Derivatives_and_Hedging_Instru1

Derivatives and Hedging Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location	'


			Assets (Liabilities or Equity) Fair Value
	In millions	Balance Sheet Location	As of September 30, 2013			As of December 31, 2012
	Derivatives designated as hedging:
	Cross currency swaps	Accrued liabilities	$	(7.8	)	$	—

	Cross currency swaps	Accumulated other comprehensive loss	$	7.8		$	—

	Interest rate swaps	Accrued liabilities and other liabilities	$	(28.6	)	$	(5.0	)
	Interest rate swaps	Accumulated other comprehensive loss	$	2.3		$	4.3

	Interest rate cap	Prepaid and other current assets	$	0.2		$	—

	Interest rate cap	Accumulated other comprehensive income	$	(0.2	)	$	—

	Derivatives not designated as hedging:
	Suntech warrant	Other assets	$	0.2		$	0.2

	Currency forward contracts	Prepaid and other current assets	$	1.7		$	0.5

	Currency forward contracts	Accrued liabilities	$	(1.4	)	$	(7.1	)
	Interest rate swaps	Prepaid and other current assets	$	0.1		$	—

	Interest rate swaps	Accrued liabilities	$	(0.4	)	$	—

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]	'



			Losses (Gains)						Losses (Gains)
			Three Months Ended September 30,						Nine Months Ended September 30,
	In millions	Statement of Operations Location	2013			2012			2013		2012
	Derivatives not designated as hedging:
	Suntech warrant	Other, net	$	(0.2	)	$	0.2		$	—	$	0.4

	Currency forward contracts	Other, net	$	(4.3	)	$	(7.6	)	$	6.2	$	(6.4	)

	Interest rate swaps	Interest expense	$	1.1		$	—		$	1.4	$	—

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Financial Instruments Measured at Fair Value on Recurring Basis	'


	In millions	As of September 30, 2013												As of December 31, 2012
	Assets (liabilities):	Level 1			Level 2			Level 3			Total			Level 1			Level 2			Level 3			Total
	Available-for-sale investments	$	—		$	14.3		$	—		$	14.3		$	—		$	13.4		$	—		$	13.4

	Suntech warrant	—			—			0.2			0.2			—			—			0.2			0.2

	Interest rate swap liabilities	—			(29.0		)	—			(29.0		)	—			(5.0		)	—			(5.0		)

	Interest rate swap assets	—			0.1			—			0.1			—			—			—			—

	Interest rate cap	—			0.2			—			0.2			—			—			—			—

	Currency forward liabilities	(1.4		)	—			—			(1.4		)	(6.6		)	—			—			(6.6		)

	Currency forward assets	1.7			—			—			1.7			—			—			—			—

	Cross currency swaps	—			(7.8		)	—			(7.8		)	—			—			—			—

	Contingent consideration related to acquisitions	—			—			(50.4		)	(50.4		)	—			—			(24.9		)	(24.9		)

	Total	$	0.3		$	(22.2	)	$	(50.2	)	$	(72.1	)	$	(6.6	)	$	8.4		$	(24.7	)	$	(22.9	)

Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis	'


	In millions	Suntech			Contingent			Total
		Warrant			Consideration
					Related to
					Acquisitions
	Balance, December 31, 2011	$	0.5		$	(90.8	)	$	(90.3	)

	Total unrealized losses included in earnings (1)	(0.4		)	(11.5		)	(11.9		)
	Acquisitions, sales, redemptions and payments	—			67.3			67.3

	Balance, September 30, 2012	$	0.1		$	(35.0	)	$	(34.9	)

	Balance, December 31, 2012	$	0.2		$	(24.9	)	$	(24.7	)

	Total unrealized losses included in earnings (1)	—			(3.1		)	(3.1		)

	Acquisitions	—			(22.4		)	(22.4		)

	Balance, September 30, 2013	$	0.2		$	(50.4	)	$	(50.2	)

	The amount of total losses for the nine months ended September 30, 2013 included in earnings attributable to the change in unrealized losses relating to assets and liabilities still held at the reporting date	$	—		$	(3.1	)	$	(3.1	)

Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]	'


		As of September 30, 2013						As of December 31, 2012
	In millions	Carrying Amount			Estimated Fair Value (1)			Carrying Amount			Estimated Fair Value (1)
	Total debt and capital lease obligations	$	3,118.30		$	2,721.70		$	2,368.30		$	1,736.20

Income_loss_Per_Share_Tables

Income (loss) Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Schedule of Calculation of Basic and Diluted (loss) Earnings Per Share	'
	For the nine month periods ended September 30, 2013 and 2012, basic and diluted EPS was calculated as follows:


		Nine Months Ended September 30, 2013						Nine Months Ended September 30, 2012
	In millions, except per share amounts	Basic			Diluted			Basic			Diluted
	EPS Numerator:
	Net loss attributable to SunEdison stockholders	$	(300.3	)	$	(300.3	)	$	(138.8	)	$	(138.8	)
	Adjustment of redeemable noncontrolling interest	(6.8		)	(6.8		)	(0.9		)	(0.9		)
	Adjusted net loss to SunEdison stockholders	$	(307.1	)	$	(307.1	)	$	(139.7	)	$	(139.7	)

	EPS Denominator:
	Weighted-average shares outstanding	233.3			233.3			230.8			230.8

	Loss per share	$	(1.32	)	$	(1.32	)	$	(0.61	)	$	(0.61	)


		Three Months Ended September 30, 2013						Three Months Ended September 30, 2012
	In millions, except per share amounts	Basic			Diluted			Basic			Diluted
	EPS Numerator:
	Net (loss) income attributable to SunEdison stockholders	$	(108.0	)	$	(108.0	)	$	37		$	37

	Adjustment of redeemable noncontrolling interest	(2.4		)	(2.4		)	(0.9		)	(0.9		)
	Adjusted net (loss) income to SunEdison stockholders	$	(110.4	)	$	(110.4	)	$	36.1		$	36.1


	EPS Denominator:
	Weighted-average shares outstanding	236.9			236.9			230.9			230.9

	Stock options and restricted stock units	—			—			—			1.1

	(Loss) earnings per share	$	(0.47	)	$	(0.47	)	$	0.16		$	0.16

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2013
Stockholders' Equity Note [Abstract]	'
Changes in Stockholders Equity	'


	In millions	SunEdison Stockholders’				Noncontrolling				Total Stockholders' Equity				Redeemable Noncontrolling Interest
		Equity				Interest
	Balance, January 1, 2013	$	575.3			$	90.8			$	666.1			$	11.3

	Net loss	(300.3		)		(6.4		)		(306.7		)		(3.2		)
	Translation adjustment, net	(40.9		)		2.2				(38.7		)		—

	Adjustment of redeemable noncontrolling interest	(6.8		)		—				(6.8		)		6.8

	Reclassification of redeemable noncontrolling interest to liability	—				—				—				(14.9		)

	Other comprehensive loss, net of tax	(3.0		)		—				(3.0		)		—

	Stock plans, net	22.4				—				22.4				—

	Issuance of common stock	239.6				—				239.6				—

	Deconsolidation of entities	0.1				(6.2		)		(6.1		)		—

	SunEdison - contributions from partner	0.6				16.1				16.7				—

	Balance, September 30, 2013	$	487			$	96.5			$	583.5			$	—

Outstanding Stock Options	'


		Shares			Weighted-				Aggregate Intrinsic				Weighted-
					Average				Value				Average
					Exercise Price				(in millions)				Remaining
													Contractual
													Life
													(in years)
	Outstanding at December 31, 2012	21,411,119			$	6.12

	Granted	5,778,183			8.74

	Exercised	(183,102	)		3.02

	Forfeited	(2,550,469	)		5.66

	Expired	(431,628	)		20.01

	Outstanding at September 30, 2013	24,024,103			$	6.57			$	73.5			8

	Options exercisable at September 30, 2013	4,546,599			$	12.27			$	6.6			6

Outstanding Restricted Stock Units	'


		Restricted Stock			Aggregate Intrinsic				Weighted-
		Units			Value				Average Remaining
					(in millions)				Contractual Life
									(in years)
	Outstanding at December 31, 2012	4,401,768

	Granted	1,304,560

	Converted	(852,204	)
	Forfeited	(641,828	)
	Outstanding at September 30, 2013	4,212,296			$	35.8			2

Comprehensive_Loss_Tables

Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2013
Statement of Other Comprehensive Income [Abstract]	'
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'

	The following table presents the changes in each component of accumulated other comprehensive loss, net of tax, and the affected line in the condensed consolidated statement of operations for reclassifications:


		Three Months Ended September 30, 2013				Nine Months Ended September 30, 2013
	In millions	Net of Tax Amount				Net of Tax Amount
	Foreign currency translation adjustments	$	8.9			$	(40.9	)

	Unrealized gain on available-for-sale securities	0.8				0.9

	Unrealized gain (loss) on hedging instruments	9.7				(5.4		)

	Loss on settlements of hedging instruments (1)	—				(0.4		)

	Actuarial gain	1.9				1.9

	Other comprehensive income (loss)	$	21.3			$	(43.9	)

	__________________________

	-1	These other comprehensive loss components are included in interest expense.
	Unaudited Condensed Consolidating Statement of Comprehensive Loss
	Nine Months Ended September 30, 2012
	(In millions)



		SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
	Net (loss) income	$	(138.8	)		$	(194.0	)		$	145.1			$	50.7			$	(137.0	)

	Other comprehensive (loss) income, net of tax:
	Net foreign currency translation adjustment	—				—				2.7				—				2.7

	Net unrealized loss on available-for-sale securities	—				—				(1.5		)		—				(1.5		)

	Unrealized loss on hedging instruments	—				—				(0.8		)		—				(0.8		)

	Actuarial gain (loss) and amortization of prior service cost	1.6				—				(10.5		)		—				(8.9		)

	Other comprehensive income (loss), net of tax	1.6				—				(10.1		)		—				(8.5		)

	Total comprehensive (loss) income	$	(137.2	)		$	(194.0	)		$	135			$	50.7			$	(145.5	)

	Net income attributable to noncontrolling interests	—				(0.8		)		(1.0		)		—				(1.8		)

	Net translation adjustment attributable to noncontrolling interests	—				—				(1.0		)		—				(1.0		)

	Comprehensive (loss) income attributable to SunEdison stockholders	$	(137.2	)		$	(194.8	)		$	133			$	50.7			$	(148.3	)



	Unaudited Condensed Consolidating Statement of Comprehensive Loss
	Nine Months Ended September 30, 2013
	(In millions)



		SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
	Net (loss) income	$	(300.3	)		$	(474.1	)		$	14.9			$	449.6			$	(309.9	)

	Other comprehensive (loss) income, net of tax:
Net foreign currency translation adjustment	—				—				(38.7		)		—				(38.7		)

Net unrealized gain on available-for-sale securities	—				—				0.9				—				0.9

Unrealized gain (loss) on hedging instruments	0.1				—				(5.5		)		—				(5.4		)

Actuarial gain (loss) and amortization of prior service cost	1.9				—				—				—				1.9

Other comprehensive income (loss), before reclassifications	2				—				(43.3		)		—				(41.3		)

Amounts reclassified out of AOCI(1)	—				—				(0.4		)		—				(0.4		)

Other comprehensive income (loss), net of tax	2				—				(43.7		)		—				(41.7		)

Total comprehensive (loss) income	$	(298.3	)		$	(474.1	)		$	(28.8	)		$	449.6			$	(351.6	)

Net loss (income) attributable to noncontrolling interests	—				(0.8		)		10.4				—				9.6

Net foreign currency translation adjustment attributable to noncontrolling interests	—				—				(2.2		)		—				(2.2		)

Comprehensive (loss) income attributable to SunEdison stockholders	$	(298.3	)		$	(474.9	)		$	(20.6	)		$	449.6			$	(344.2	)


(1) Amounts reclassified out of AOCI relate to settlements of hedging instruments and are recognized in interest expense in the condensed consolidating statement of operations. See Note 10.
Comprehensive Income (Loss) [Table Text Block]	'
	The following table presents the changes in each component of accumulated other comprehensive loss, net of tax:


	In millions	Foreign Currency Items (1)				Available-for-sale Securities				Hedging Activities				Pension Plans				Accumulated Other Comprehensive Loss
	Balance, December 31, 2012	$	32.3			$	(7.6	)		$	(4.3	)		$	(60.2	)		$	(39.8	)

	Other comprehensive (loss) income before reclassifications	(40.9		)		0.9				(5.4		)		1.9				(43.5		)

	Amounts reclassified from accumulated other comprehensive income	—				—				(0.4		)		—				(0.4		)

	Net current-period other comprehensive (loss) income	(40.9		)		0.9				(5.8		)		1.9				(43.9		)

	Balance, September 30, 2013	$	(8.6	)		$	(6.7	)		$	(10.1	)		$	(58.3	)		$	(83.7	)

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2013
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]	'
Schedule of Variable Interest Entities	'


	In millions	As of September 30, 2013			As of December 31, 2012
	Current assets	$	325.1		$	10.3

	Noncurrent assets	329.8			56.2

	Total assets	$	654.9		$	66.5

	Current liabilities	$	(121.3	)	$	(8.5	)
	Noncurrent liabilities	(449.4		)	(69.6		)
	Total liabilities	$	(570.7	)	$	(78.1	)

Deferred_Revenue_and_Profit_Ta

Deferred Revenue and Profit (Tables)	9 Months Ended
	Sep. 30, 2013
Deferred Revenue Disclosure [Abstract]	'
Schedule of Deferred Revenue and Profit	'
	Deferred revenue consists of the following:



	In millions	As of September 30, 2013		As of December 31, 2012
	Deferred revenue for solar energy systems:
	Short-term profit deferrals and deposits on solar energy system sales	$	120.2	$	113.1

	Long-term profit deferrals and deposits on solar energy system sales	82.1		126.4

	Deferred subsidy revenue	19.6		19.6

	Total solar energy system deferred revenue	$	221.9	$	259.1

	Non-solar energy system deferred revenue:
	Short-term deferred revenue	—		—

	Long-term deferred revenue	3.5		29.2

	Total non-solar energy system deferred revenue	3.5		29.2

	Total deferred revenue	$	225.4	$	288.3

Reportable_Segments_Tables

Reportable Segments (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Schedule of Reportable Segments	'


		Three Months Ended						Nine Months Ended September 30,
		September 30,
	In millions	2013			2012			2013			2012
	Net sales:
	Semiconductor Materials	$	230.7		$	240.3		$	699.5		$	689

	Solar Energy	380.8			361.3			756.9			1,240.20

	Consolidated net sales	$	611.5		$	601.6		$	1,456.40		$	1,929.20

	Operating income (loss):
	Semiconductor Materials	$	(0.8	)	$	8.7		$	4.2		$	(8.1	)

	Solar Energy	(17.3		)	75.8			(53.3		)	70.4

	Corporate and Other	(31.0		)	(25.6		)	(80.1		)	(72.9		)
	Consolidated operating (loss) income	$	(49.1	)	$	58.9		$	(129.2	)	$	(10.6	)

	Interest (income) expense:
	Semiconductor Materials	$	—		$	(0.3	)	$	(0.9	)	$	(0.8	)

	Solar Energy	25.1			14.7			67			60.7

	Corporate and Other	20.1			13.6			61.2			40.4

	Consolidated interest expense	$	45.2		$	28		$	127.3		$	100.3

	Depreciation and amortization:
	Semiconductor Materials	$	29.4		$	30.6		$	90.4		$	92.6

	Solar Energy	38.7			26.5			95.7			70.5

	Corporate and Other	2.5			2			6.3			5.3

	Consolidated depreciation and amortization	$	70.6		$	59.1		$	192.4		$	168.4

	Capital expenditures:
	Semiconductor Materials	$	17.2		$	14.6		$	65.8		$	55.6

	Solar Energy (1)	150.4			44.9			291.3			231.3

	Corporate and Other	2.8			—			5.4			6.6

	Consolidated capital expenditures	$	170.4		$	59.5		$	362.5		$	293.5

Condensed_Consolidating_Financ1

Condensed Consolidating Financial Information (Tables)	9 Months Ended
	Sep. 30, 2013
Condensed Consolidating Financial Information [Abstract]	'
Schedule of Condensed Consolidating Statement of Operations	'
	Unaudited Condensed Consolidating Statement of Operations
	For the Three Months Ended September 30, 2013
	(In millions)



		SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
	Net sales	$	193.9			$	224.8			$	952.5			$	(759.7	)		$	611.5

	Cost of goods sold	208.1				221.4				778.5				(657.1		)		550.9

	Gross profit	(14.2		)		3.4				174				(102.6		)		60.6

	Operating expenses:
	Marketing and administration	30.2				23				37.9				—				91.1

	Research and development	12.7				3.5				2.4				—				18.6

	Restructuring and impairment (reversals) charges	0.5				0.3				(0.8		)		—				—

	Operating (loss) income	(57.6		)		(23.4		)		134.5				(102.6		)		(49.1		)

	Non-operating expense (income):
	Interest expense	22.1				5.5				17.6				—				45.2

	Interest income	—				—				(0.7		)		—				(0.7		)

	Other, net	(12.3		)		6.3				11.5				—				5.5

	Total non-operating expense	9.8				11.8				28.4				—				50

	(Loss) income before income taxes, investment in subsidiary (loss) income and equity in loss of joint ventures	(67.4		)		(35.2		)		106.1				(102.6		)		(99.1		)

	Income tax (benefit) expense	(161.0		)		155.1				22.8				0.2				17.1

	Income (loss) before investment in subsidiary income (loss) and equity in income (loss) of joint ventures	93.6				(190.3		)		83.3				(102.8		)		(116.2		)

	Investment in subsidiary (loss) income	(201.6		)		(83.5		)		—				285.1				—

	Equity in income of joint ventures, net of tax	—				—				4.1				—				4.1

	Net (loss) income	(108.0		)		(273.8		)		87.4				182.3				(112.1		)

	Net (income) loss attributable to noncontrolling interests	—				(0.5		)		4.6				—				4.1

	Net (loss) income attributable to SunEdison stockholders	$	(108.0	)		$	(274.3	)		$	92			$	182.3			$	(108.0	)

	Unaudited Condensed Consolidating Statement of Operations
	For the Three Months Ended September 30, 2012
	(In millions)



		SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
	Net sales	$	189.7			$	375.9			$	667.2			$	(631.2	)		$	601.6

	Cost of goods sold	204.1				410.9				577.2				(677.5		)		514.7

	Gross profit	(14.4		)		(35.0		)		90				46.3				86.9

	Operating expenses:
Marketing and administration	26.3				14.3				28.3				—				68.9

Research and development	11.9				3.7				1.8				—				17.4

Restructuring and impairment (reversals) charges	16.2				(1.1		)		(73.4		)		—				(58.3		)

Operating (loss) income	(68.8		)		(51.9		)		133.3				46.3				58.9

Non-operating expense (income):
Interest expense	12.4				—				15.6				—				28

Interest income	—				—				(0.9		)		—				(0.9		)

Other, net	(11.0		)		17.7				(10.8		)		1.7				(2.4		)

Total non-operating expense	1.4				17.7				3.9				1.7				24.7

(Loss) income before income taxes, investment in subsidiary (loss) income and equity in loss of joint ventures	(70.2		)		(69.6		)		129.4				44.6				34.2

Income tax (benefit) expense	(22.2		)		(4.6		)		24.8				(1.3		)		(3.3		)

(Loss) income before investment in subsidiary (loss) income and equity in loss of joint ventures	(48.0		)		(65.0		)		104.6				45.9				37.5

Investment in subsidiary income (loss)	85				80.6				—				(165.6		)		—

Equity in loss of joint ventures, net of tax	—				—				0.9				—				0.9

Net income (loss)	37				15.6				105.5				(119.7		)		38.4

Net income attributable to noncontrolling interests	—				(0.4		)		(1.0		)		—				(1.4		)

Net income (loss) attributable to SunEdison stockholders	$	37			$	15.2			$	104.5			$	(119.7	)		$	37

Schedule of Condensed Income Statement [Table Text Block]	'
	Unaudited Condensed Consolidating Statement of Operations
	For the Nine Months Ended September 30, 2013
	(In millions)



		SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
	Net sales	$	580.8			$	385.2			$	2,262.90			$	(1,772.5	)		$	1,456.40

	Cost of goods sold	625.9				377.4				2,005.40				(1,711.8		)		1,296.90

	Gross profit	(45.1		)		7.8				257.5				(60.7		)		159.5

	Operating expenses:
	Marketing and administration	84.9				62.5				92.8				—				240.2

	Research and development	36.4				9.9				7.8				—				54.1

	Restructuring and impairment (reversals) charges	1.5				0.3				(7.4		)		—				(5.6		)

	Operating (loss) income	(167.9		)		(64.9		)		164.3				(60.7		)		(129.2		)

	Non-operating expense (income):
	Interest expense	61.8				13.1				52.4				—				127.3

	Interest income	—				—				(2.0		)		—				(2.0		)

	Other, net	(24.1		)		0.3				32.8				—				9

	Total non-operating expense	37.7				13.4				83.2				—				134.3

	(Loss) income before income taxes, investment in subsidiary (loss) income and equity in loss of joint ventures	(205.6		)		(78.3		)		81.1				(60.7		)		(263.5		)

	Income tax (benefit) expense	(225.6		)		204.6				70				1.2				50.2

	Income (loss) before investment in subsidiary (loss) income and equity in loss of joint ventures	20				(282.9		)		11.1				(61.9		)		(313.7		)

	Investment in subsidiary (loss) income	(320.3		)		(191.2		)		—				511.5				—

	Equity in loss of joint ventures, net of tax	—				—				3.8				—				3.8

	Net (loss) income	(300.3		)		(474.1		)		14.9				449.6				(309.9		)

	Net (income) loss attributable to noncontrolling interests	—				(0.8		)		10.4				—				9.6

	Net (loss) income attributable to SunEdison stockholders	$	(300.3	)		$	(474.9	)		$	25.3			$	449.6			$	(300.3	)

Schedule of Condensed Balance Sheet [Table Text Block]	'
	Unaudited Condensed Consolidating Statement of Operations
	For the Nine Months Ended September 30, 2012
	(In millions)



		SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
	Net sales	$	545.1			$	705.5			$	2,288.70			$	(1,610.1	)		$	1,929.20

	Cost of goods sold	586.2				741.3				2,020.00				(1,645.7		)		1,701.80

	Gross profit	(41.1		)		(35.8		)		268.7				35.6				227.4

	Operating expenses:
	Marketing and administration	87.6				66.8				80.8				—				235.2

	Research and development	37.5				11.3				7				—				55.8

	Restructuring and impairment (reversals) charges	15.4				2.9				(71.3		)		—				(53.0		)

	Operating (loss) income	(181.6		)		(116.8		)		252.2				35.6				(10.6		)

	Non-operating expense (income):
	Interest expense	35.8				6.1				58.4				—				100.3

	Interest income	(0.1		)		—				(2.7		)		—				(2.8		)

	Other, net	(39.4		)		17.1				14.6				7.8				0.1

	Total non-operating (income) expense	(3.7		)		23.2				70.3				7.8				97.6

	(Loss) income before income taxes, investment in subsidiary (loss) income and equity in loss of joint ventures	(177.9		)		(140.0		)		181.9				27.8				(108.2		)

	Income tax (benefit) expense	(68.9		)		60.9				35.9				—				27.9

	(Loss) income before investment in subsidiary (loss) income and equity in loss of joint ventures	(109.0		)		(200.9		)		146				27.8				(136.1		)

	Investment in subsidiary (loss) income	(29.8		)		6.9				—				22.9				—

	Equity in loss of joint ventures, net of tax	—				—				(0.9		)		—				(0.9		)

	Net (loss) income	(138.8		)		(194.0		)		145.1				50.7				(137.0		)

	Net income attributable to noncontrolling interests	—				(0.8		)		(1.0		)		—				(1.8		)

	Net (loss) income attributable to SunEdison stockholders	$	(138.8	)		$	(194.8	)		$	144.1			$	50.7			$	(138.8	)

Comprehensive Income (Loss) Note [Text Block]	'
	Comprehensive Loss

	Comprehensive income (loss) represents a measure of all changes in equity that result from recognized transactions and other economic events other than transactions with owners in their capacity as owners. Other comprehensive loss includes foreign currency translations, gains (losses) on available-for-sale securities, gains (losses) on hedging instruments and pension adjustments.

	The following table presents the changes in each component of accumulated other comprehensive loss, net of tax:


	In millions	Foreign Currency Items (1)				Available-for-sale Securities				Hedging Activities				Pension Plans				Accumulated Other Comprehensive Loss
	Balance, December 31, 2012	$	32.3			$	(7.6	)		$	(4.3	)		$	(60.2	)		$	(39.8	)

	Other comprehensive (loss) income before reclassifications	(40.9		)		0.9				(5.4		)		1.9				(43.5		)

	Amounts reclassified from accumulated other comprehensive income	—				—				(0.4		)		—				(0.4		)

	Net current-period other comprehensive (loss) income	(40.9		)		0.9				(5.8		)		1.9				(43.9		)

	Balance, September 30, 2013	$	(8.6	)		$	(6.7	)		$	(10.1	)		$	(58.3	)		$	(83.7	)
	__________________________

	(1)	Excludes foreign currency adjustments as it relates to noncontrolling interests. Refer to the condensed consolidated statements of comprehensive loss.

	The following table presents the changes in each component of accumulated other comprehensive loss, net of tax, and the affected line in the condensed consolidated statement of operations for reclassifications:


		Three Months Ended September 30, 2013				Nine Months Ended September 30, 2013
	In millions	Net of Tax Amount				Net of Tax Amount
	Foreign currency translation adjustments	$	8.9			$	(40.9	)

	Unrealized gain on available-for-sale securities	0.8				0.9

	Unrealized gain (loss) on hedging instruments	9.7				(5.4		)

	Loss on settlements of hedging instruments (1)	—				(0.4		)

	Actuarial gain	1.9				1.9

	Other comprehensive income (loss)	$	21.3			$	(43.9	)

	__________________________

	-1	These other comprehensive loss components are included in interest expense.
	Unaudited Condensed Consolidating Statement of Comprehensive Loss
	Three Months Ended September 30, 2013
	(In millions)



		SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
	Net (loss) income	$	(108.0	)		$	(273.8	)		$	87.4			$	182.3			$	(112.1	)

	Other comprehensive income (loss), net of tax:
	Net foreign currency translation adjustment	—				—				13.7				—				13.7

	Net unrealized gain (loss) on available-for-sale securities	—				—				0.8				—				0.8

	Unrealized gain on hedging instruments	0.5				—				9.2				—				9.7

	Actuarial gain (loss) and amortization of prior service cost	1.9				—				—				—				1.9

	Other comprehensive loss, before reclassifications	2.4				—				23.7				—				26.1

	Amounts reclassified out of AOCI(1)	—				—				—				—				—

Other comprehensive income, net of tax	2.4				—				23.7				—				26.1

Total comprehensive (loss) income	$	(105.6	)		$	(273.8	)		$	111.1			$	182.3			$	(86.0	)

Net income attributable to noncontrolling interests	—				(0.5		)		4.6				—				4.1

Net foreign currency translation adjustment attributable to noncontrolling interests	—				—				(4.8		)		—				(4.8		)

Comprehensive (loss) income attributable to SunEdison stockholders	$	(105.6	)		$	(274.3	)		$	110.9			$	182.3			$	(86.7	)

Unaudited Condensed Consolidating Statement of Comprehensive Loss
Three Months Ended September 30, 2012
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
Net income (loss)	$	37			$	15.6			$	105.5			$	(119.7	)		$	38.4

Other comprehensive income (loss), net of tax:
Net foreign currency translation adjustment	—				—				13.5				—				13.5

Net unrealized loss on available-for-sale securities	—				—				(2.8		)		—				(2.8		)

Unrealized loss on hedging instruments	—				—				(0.7		)		—				(0.7		)

Actuarial gain (loss) and amortization of prior service cost	0.2				—				—				—				0.2

Other comprehensive income, net of tax	0.2				—				10				—				10.2

Total comprehensive income (loss)	$	37.2			$	15.6			$	115.5			$	(119.7	)		$	48.6

Net income attributable to noncontrolling interests	—				(0.4		)		(1.0		)		—				(1.4		)

Net translation adjustment attributable to noncontrolling interests	—				—				(1.1		)		—				(1.1		)

Comprehensive income (loss) attributable to SunEdison stockholders	$	37.2			$	15.2			$	113.4			$	(119.7	)		$	46.1

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'

	The following table presents the changes in each component of accumulated other comprehensive loss, net of tax, and the affected line in the condensed consolidated statement of operations for reclassifications:


		Three Months Ended September 30, 2013				Nine Months Ended September 30, 2013
	In millions	Net of Tax Amount				Net of Tax Amount
	Foreign currency translation adjustments	$	8.9			$	(40.9	)

	Unrealized gain on available-for-sale securities	0.8				0.9

	Unrealized gain (loss) on hedging instruments	9.7				(5.4		)

	Loss on settlements of hedging instruments (1)	—				(0.4		)

	Actuarial gain	1.9				1.9

	Other comprehensive income (loss)	$	21.3			$	(43.9	)

	__________________________

	-1	These other comprehensive loss components are included in interest expense.
	Unaudited Condensed Consolidating Statement of Comprehensive Loss
	Nine Months Ended September 30, 2012
	(In millions)



		SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
	Net (loss) income	$	(138.8	)		$	(194.0	)		$	145.1			$	50.7			$	(137.0	)

	Other comprehensive (loss) income, net of tax:
	Net foreign currency translation adjustment	—				—				2.7				—				2.7

	Net unrealized loss on available-for-sale securities	—				—				(1.5		)		—				(1.5		)

	Unrealized loss on hedging instruments	—				—				(0.8		)		—				(0.8		)

	Actuarial gain (loss) and amortization of prior service cost	1.6				—				(10.5		)		—				(8.9		)

	Other comprehensive income (loss), net of tax	1.6				—				(10.1		)		—				(8.5		)

	Total comprehensive (loss) income	$	(137.2	)		$	(194.0	)		$	135			$	50.7			$	(145.5	)

	Net income attributable to noncontrolling interests	—				(0.8		)		(1.0		)		—				(1.8		)

	Net translation adjustment attributable to noncontrolling interests	—				—				(1.0		)		—				(1.0		)

	Comprehensive (loss) income attributable to SunEdison stockholders	$	(137.2	)		$	(194.8	)		$	133			$	50.7			$	(148.3	)



	Unaudited Condensed Consolidating Statement of Comprehensive Loss
	Nine Months Ended September 30, 2013
	(In millions)



		SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
	Net (loss) income	$	(300.3	)		$	(474.1	)		$	14.9			$	449.6			$	(309.9	)

	Other comprehensive (loss) income, net of tax:
Net foreign currency translation adjustment	—				—				(38.7		)		—				(38.7		)

Net unrealized gain on available-for-sale securities	—				—				0.9				—				0.9

Unrealized gain (loss) on hedging instruments	0.1				—				(5.5		)		—				(5.4		)

Actuarial gain (loss) and amortization of prior service cost	1.9				—				—				—				1.9

Other comprehensive income (loss), before reclassifications	2				—				(43.3		)		—				(41.3		)

Amounts reclassified out of AOCI(1)	—				—				(0.4		)		—				(0.4		)

Other comprehensive income (loss), net of tax	2				—				(43.7		)		—				(41.7		)

Total comprehensive (loss) income	$	(298.3	)		$	(474.1	)		$	(28.8	)		$	449.6			$	(351.6	)

Net loss (income) attributable to noncontrolling interests	—				(0.8		)		10.4				—				9.6

Net foreign currency translation adjustment attributable to noncontrolling interests	—				—				(2.2		)		—				(2.2		)

Comprehensive (loss) income attributable to SunEdison stockholders	$	(298.3	)		$	(474.9	)		$	(20.6	)		$	449.6			$	(344.2	)


(1) Amounts reclassified out of AOCI relate to settlements of hedging instruments and are recognized in interest expense in the condensed consolidating statement of operations. See Note 10.
Schedule of Condensed Consolidating Balance Sheet	'
	Unaudited Condensed Consolidating Balance Sheet
	September 30, 2013
	(In millions)



		SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	Current liabilities:
	Current portion of long-term debt and short term borrowing	$	—			$	—			$	19.7			$	—			$	19.7

	Short-term solar energy system financing and capital lease obligations	—				0.2				261.4				—				261.6

	Accounts payable	26.2				23.2				618.1				—				667.5

	Accrued liabilities	17.9				112.6				278.1				—				408.6

	Contingent consideration payable related to acquisitions	—				26.8				—				—				26.8

	Deferred revenue for solar energy systems	—				27.3				92.9				—				120.2

	Customer and other deposits	7.6				0.5				26.7				—				34.8

	Intercompany (receivable) payable and short-term notes	(907.1		)		989.3				(82.2		)		—				—

	Total current liabilities	(855.4		)		1,179.90				1,214.70				—				1,539.20

	Long-term debt, less current portion	746.6				—				9.5				—				756.1

	Long-term solar energy system financing and capital lease obligations, less current portion	—				9.7				2,071.20				—				2,080.90

	Customer and other deposits	156.3				—				9.1				—				165.4

	Deferred revenue for solar energy systems	—				30.1				71.6				—				101.7

	Non-solar energy system deferred revenue	—				—				3.5				—				3.5

	Long-term intercompany notes (receivable) payable	(68.4		)		(94.5		)		162.9				—				—

	Other liabilities	35				10.4				289.3				—				334.7

	Total liabilities	14.1				1,135.60				3,831.80				—				4,981.50

	Redeemable noncontrolling interests	—				—				—				—				—

	Total SunEdison stockholders’ equity	487				(519.5		)		759.2				(239.7		)		487

	Noncontrolling interests	—				0.6				95.9				—				96.5

	Total stockholders’ equity	487				(518.9		)		855.1				(239.7		)		583.5

	Total liabilities and stockholders’ equity	$	501.1			$	616.7			$	4,686.90			$	(239.7	)		$	5,565.00

	Unaudited Condensed Consolidating Balance Sheet
	September 30, 2013
	(In millions)



		SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
						Subsidiaries				Subsidiaries				Adjustments
	ASSETS
Current assets:
Cash and cash equivalents	$	131.5			$	99.3			$	409.5			$	—			$	640.3

Restricted cash	—				1.8				115.3				—				117.1

Accounts receivable, net	59.8				29.8				245.7				—				335.3

Inventories	22.8				22.8				191.1				(28.9		)		207.8

Solar energy systems held for development and sale	—				—				410.6				(53.9		)		356.7

Prepaid expenses and other current assets	29.7				49.7				166.7				—				246.1

Total current assets	243.8				203.4				1,538.90				(82.8		)		1,903.30

Investments in subsidiaries	110.2				69.3				—				(179.5		)		—

Property, plant and equipment, net:
Non-solar energy systems, net	65				282.7				853				(48.9		)		1,151.80

Solar energy systems, net	—				1.2				1,812.20				71.5				1,884.90

Restricted cash	—				1.7				57.3				—				59

Other assets	82.1				58.4				425.5				—				566

Total assets	$	501.1			$	616.7			$	4,686.90			$	(239.7	)		$	5,565.00

Unaudited Condensed Consolidating Balance Sheet
December 31, 2012
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
ASSETS
Current assets:
Cash and cash equivalents	$	65.1			$	60			$	447.5			$	—			$	572.6

Restricted cash	—				—				72.4				—				72.4

Accounts receivable, net	62				23.7				134.7				—				220.4

Inventories	18.4				70.6				200				(41.2		)		247.8

Solar energy systems held for development and sale	—				0.3				213.7				(80.2		)		133.8

Prepaid expenses and other current assets	24.9				40.1				147.4				—				212.4

Total current assets	170.4				194.7				1,215.70				(121.4		)		1,459.40

Investments in subsidiaries	498.2				564.2				—				(1,062.4		)		—

Property, plant and equipment, net:
Non-solar energy systems, net	57.2				294.4				913.8				(52.3		)		1,213.10

Solar energy systems, net	—				3				1,361.30				95.6				1,459.90

Restricted cash	—				1.7				48.5				—				50.2

Other assets	36.7				175.3				350.7				—				562.7

Total assets	$	762.5			$	1,233.30			$	3,890.00			$	(1,140.5	)		$	4,745.30



Unaudited Condensed Consolidating Balance Sheet
December 31, 2012
(In millions)



	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Current portion of long-term debt and short term borrowing	$	—			$	—			$	3.4			$	—			$	3.4

Short-term solar energy system financing and capital lease obligations	—				0.2				97.6				—				97.8

Accounts payable	11.9				67				398.1				—				477

Accrued liabilities	32.8				42.5				267.7				—				343

Contingent consideration payable related to acquisitions	—				23.1				—				—				23.1

Deferred revenue for solar energy systems	—				40.7				72.4				—				113.1

Customer and other deposits	10.9				0.4				65.9				—				77.2

Intercompany (receivable) payable and short-term notes	(651.0		)		764.3				(113.3		)		—				—

Total current liabilities	(595.4		)		938.2				791.8				—				1,134.60

Long-term debt, less current portion	746.1				—				12.6				—				758.7

Long-term solar energy system financing and capital lease obligations, less current portion	—				9.8				1,498.60				—				1,508.40

Customer and other deposits	87.8				—				96.7				—				184.5

Deferred revenue for solar energy systems	—				45.8				100.2				—				146

Non-solar energy system deferred revenue	—				—				29.2				—				29.2

Long-term intercompany notes (receivable) payable	(45.4		)		(96.2		)		141.6				—				—

Other liabilities	(5.9		)		112				200.4				—				306.5

Total liabilities	187.2				1,009.60				2,871.10				—				4,067.90

Redeemable noncontrolling interests	—				—				11.3				—				11.3

Total SunEdison stockholders’ equity	575.3				223.7				916.8				(1,140.5		)		575.3

Noncontrolling interests	—				—				90.8				—				90.8

Total stockholders’ equity	575.3				223.7				1,007.60				(1,140.5		)		666.1

Total liabilities and stockholders’ equity	$	762.5			$	1,233.30			$	3,890.00			$	(1,140.5	)		$	4,745.30

Condensed Consolidating Statement of Cash Flows	'
	Unaudited Condensed Consolidating Statement of Cash Flows
	For the Nine Months Ended September 30, 2012
	(In millions)



		SunEdison, Inc.					Guarantor				Non-Guarantor				Consolidating				Total
							Subsidiaries				Subsidiaries				Adjustments
	Cash flows from operating activities:
	Net cash used in operating activities	$	(100.2	)			$	28.9			$	(152.5	)		$	(59.6	)		$	(283.4	)

	Cash flows from investing activities:

	Capital expenditures	(14.7		)			(16.3		)		(69.3		)		—				(100.3		)

	Construction of solar energy systems	—					—				(243.3		)		50.1				(193.2		)

	Purchases of cost and equity method investments	(3.8		)			—				(31.4		)		—				(35.2		)

	Net proceeds from (used in) equity method investments	7.2					—				(4.2		)		—				3

	Change in restricted cash	—					(2.1		)		0.8				—				(1.3		)

	Equity infusions or investments in subsidiaries	(44.0		)			(6.7		)		50.7				—				—

	Receipts to vendors for deposits and loans	—					—				4.8				—				4.8

	Other	1.9					—				(11.5		)		9.5				(0.1		)

	Net cash used in investing activities	(53.4		)			(25.1		)		(303.4		)		59.6				(322.3		)


	Cash flows from financing activities:
	Cash paid for contingent consideration for acquisitions	—					(3.8		)		(54.2		)		—				(58.0		)

	Proceeds from solar energy system financing and capital lease obligations	—					8.4				711.9				—				720.3

	Repayments of solar energy system financing and capital lease obligations	—					(0.5		)		(183.5		)		—				(184.0		)

	Net repayments of customer deposits related to long-term supply agreements	—					—				(23.6		)		—				(23.6		)

	Principal payments on long term debt	—					—				(1.8		)		—				(1.8		)

	(Repayment) collection of intercompany debt	(33.8		)	—		9.5				24.3				—				—

	Common stock issued and repurchased	(0.1		)			—				—				—				(0.1		)

	Second lien term loans	196					—				—				—				196

	Proceeds from noncontrolling interests	—					—				16.4				—				16.4

	Debt financing fees	(12.7		)			—				(22.5		)		—				(35.2		)

	Net cash provided by financing activities	149.4					13.6				467				—				630

	Effect of exchange rate changes on cash and cash equivalents	(0.2		)			—				(0.1		)		—				(0.3		)

	Net (decrease) increase in cash and cash equivalents	(4.4		)			17.4				11				—				24

	Cash and cash equivalents at beginning of period	228.9					58.3				298.6				—				585.8

	Cash and cash equivalents at end of period	224.5					75.7				309.6				—				$	609.8

Unaudited Condensed Consolidating Statement of Cash Flows
For the Nine Months Ended September 30, 2013
(In millions)


	SunEdison, Inc.				Guarantor				Non-Guarantor				Consolidating				Total
					Subsidiaries				Subsidiaries				Adjustments
Cash flows from operating activities:
Net cash (used in) provided by operating activities	$	(48.6	)		$	5.5			$	(431.7	)		$	167.2			$	(307.6	)

Cash flows from investing activities:
Capital expenditures	(11.4		)		(8.2		)		(81.6		)		—				(101.2		)

Construction of solar energy systems	—				—				(97.1		)		(164.2		)		(261.3		)

Purchases of cost and equity method investments	—				(1.5		)		(45.1		)		—				(46.6		)

Net proceeds from equity method investments	68.5				—				(0.1		)		—				68.4

Change in restricted cash	—				(0.5		)		(16.3		)		—				(16.8		)

Cash paid for acquisition, net of cash acquired	—				—				(7.3		)		—				(7.3		)

Receipts from vendors for deposits	—				—				0.6				—				0.6

Equity infusions or investments in subsidiaries	(66.8		)		(24.2		)		91				—				—

Other	0.7				(1.3		)		8.5				(3.0		)		4.9

Net cash used in investing activities	(9.0		)		(35.7		)		(147.4		)		(167.2		)		(359.3		)
Cash flows from financing activities:
Cash paid for contingent consideration for acquisitions	—				(0.8		)		—				—				(0.8		)

Proceeds from solar energy system financing and capital lease obligations	—				—				626.4				—				626.4

Repayments of solar energy system financing and capital lease obligations	—				(0.1		)		(64.3		)		—				(64.4		)

Net repayments of customer deposits related to long-term supply agreements	—				—				(51.7		)		—				(51.7		)

Principal payments on long term debt	—				—				(1.4		)		—				(1.4		)

Common stock issued and repurchased	239.6				—				—				—				239.6

Proceeds from noncontrolling interests	—				—				25.9				—				25.9

(Repayment) collection of intercompany debt	(115.0		)		70.4				44.6				—				—

Debt financing fees	—				—				(25.6		)		—				(25.6		)

Other	(0.6		)		—				(0.8		)		—				(1.4		)

Net cash provided by financing activities	124				69.5				553.1				—				746.6

Effect of exchange rate changes on cash and cash equivalents	—				—				(12.0		)		—				(12.0		)

Net increase (decrease) in cash and cash equivalents	66.4				39.3				(38.0		)		—				67.7

Cash and cash equivalents at beginning of period	65.1				60				447.5				—				572.6

Cash and cash equivalents at end of period	$	131.5			$	99.3			$	409.5			$	—			$	640.3

Basis_of_Presentation_Details

Basis of Presentation (Details) (USD $)	3 Months Ended				6 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
2011 Income Tax Expense adjustment	'	'	$6.10	'	'	'	'	'
Out of Period Adjustment QTD Q2 2012	'	16	'	'	'	'	'	'
Out of Period Adjustment YTD Q2 2012	'	'	'	'	'	'	22.6	'
Shareholder Net Income before PII Adj Q1 2012	'	'	'	92	'	'	'	'
Out of Period Adjustment Q1 2012	'	'	'	6.6	'	'	'	'
Shareholder Net Income before PII Adj QTD Q22012	'	61.3	'	'	'	'	'	'
Deferred Income Tax Expense (Benefit)	'	'	'	'	'	40.2	4.3	'
Net loss attributable to SunEdison stockholders	-108	37	77.2	98.6	175.8	-300.3	-138.8	'
Deferred Tax out of period adjustment	'	'	'	'	'	'	'	43.7
Shareholder Net Income before PII Adj YTD Q2 2012	'	'	'	'	'	'	153.3	'
Prepaid Expense and other Assets, Current - as previously filed	'	'	'	'	'	'	'	212.2
Prepaid Expense and Other Assets, Current	246.1	'	'	'	'	246.1	'	212.4
Other Assets, Noncurrent - as previously filed	'	'	'	'	'	'	'	519.2
Other Assets, Noncurrent	566	'	'	'	'	566	'	562.7
Accrued Liabilities, Current - as previously filed	'	'	'	'	'	'	'	344.2
Accrued Liabilities, Current	408.6	'	'	'	'	408.6	'	343
Other Liabilities, Noncurrent - as previously filed	'	'	'	'	'	'	'	261.6
Other Liabilities, Noncurrent	$334.70	'	'	'	'	$334.70	'	$306.50

Restructuring_and_Impairment_C2

Restructuring and Impairment Charges (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended				3 Months Ended		0 Months Ended	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Aug. 08, 2013	Dec. 31, 2011	Mar. 31, 2013	Sep. 30, 2013	Sep. 04, 2012	Sep. 30, 2013	Dec. 31, 2012
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Aug. 08, 2013	Dec. 31, 2011	Purchase Obligation Termination [Member]	Purchase Obligation Termination [Member]	Purchase Obligation Termination [Member]	Purchase Obligation Termination [Member]	Purchase Obligation Termination [Member]
Restructuring Cost and Reserve [Line Items]	'	'	'	'	'	'	'	'	'	'	'
MEMC Global Reduction in Force	'	'	'	'	'	20.00%	'	'	'	'	'
Renesola Deposit Balance before Settlement	'	'	'	'	$34.80	'	'	'	'	'	'
Litigation Settlement, Gross	'	'	'	'	'	'	'	'	70	'	'
Payments for Legal Settlements	'	'	'	'	'	'	10	20	'	15	25
Restructuring and impairment (reversals) charges (see Note 2)	0	-58.3	-5.6	-53	'	'	'	'	'	'	'
Income related to Degussa Settlement	'	69.2	'	'	'	'	'	'	'	'	'
Restructuring Reversals - 2011 Global Plan	($1)	'	($7.60)	'	'	'	'	'	'	'	'

Restructuring_and_Impairment_C3

Restructuring and Impairment Charges (Details of Restructuring Expenses) (Details) (USD $)	3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
			Contract Termination [Member]	2011 Global Plan [Member]	2011 Global Plan [Member]	2011 Global Plan [Member]	2011 Global Plan [Member]	2011 Global Plan [Member]
						Severance and Other Employee Benefits [Member]	Contract Termination [Member]	Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]	'	'	'	'	'	'	'	'
Asset Impairment Charges	$14.20	$17.30	'	'	'	'	'	'
Restructuring Charges	'	'	'	-7.6	'	-2	-0.3	-5.3
Restructuring Reserve [Roll Forward]	'	'	'	'	'	'	'	'
Accrued, December 31, 2011	'	'	40.1	204.5	204.5	31.7	134.5	38.3
Restructuring Charges	'	'	'	-7.6	'	-2	-0.3	-5.3
Cash Payments	'	'	'	-66.8	'	-1.6	-59.7	-5.5
Restructuring Reserve - non cash settlement	'	'	'	-34.8	'	0	-34.8	0
Currency	'	'	'	1.5	'	0.5	0.4	0.6
Accrued, September 30, 2012	'	'	40.1	'	96.8	28.6	40.1	28.1
Cumulative Costs Incurred	'	'	'	'	269.9	61.2	164.3	44.4
Total Costs Expected to be Incurred	'	'	'	'	$269.90	$61.20	$164.30	$44.40

Inventories_Details

Inventories (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]	'	'
Raw materials and supplies	$74.20	$89.10
Goods and work in process	81	109.1
Finished goods	52.6	49.6
Inventories,Total	$207.80	$247.80

Inventories_Narrative_Details

Inventories (Narrative) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Inventory [Line Items]	'	'
Finished goods	$52.60	$49.60

Solar_Energy_Systems_Held_for_2

Solar Energy Systems Held for Development and Sale Solar Energy System Held for Development (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Solar Energy System Held for Development [Abstract]	'	'
solar energy systems held for development and sale variable interest entities	$17.80	'
Systems Held Under Development	338.9	133.8
Systems Held For Sale	'	0
Solar energy systems held for development and sale	$356.70	$133.80

Debt_and_Capital_Lease_Obligat2

Debt and Capital Lease Obligations (Debt) (Details) (USD $)	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]	'	'	'
Notional Amount of Interest Rate Derivatives	$200	'	'
Derivative, Cap Interest Rate	1.50%	'	'
Senior Notes	550	'	550
Senior Notes, Current	0	'	0
Senior Notes, Noncurrent	550	'	550
Loans Payable	196.6	'	196.1
Loans Payable, Current	0	'	0
Loans Payable, Noncurrent	196.6	'	196.1
Notes Payable	29.2	'	16
Notes Payable, Current	19.7	'	3.4
Notes Payable, Noncurrent	9.5	'	12.6
Debt and Capital Lease Obligations	775.8	'	762.1
Current portion of long-term debt and short term borrowings	19.7	'	3.4
Long-term debt and capital lease obligations, less current portion	756.1	'	758.7
Short Term Solar Energy System Financing And Current Portion Of Long Term Solar Energy System Financing And Capital Lease Obligations	261.6	'	97.8
Long-term solar energy system financing and capital lease obligations, less current portion, including consolidated variable interest entities	2,080.90	'	1,508.40
Debt And Capital Lease Obligations Including Solar Energy Systems Financing	3,118.30	'	2,368.30
Debt And Capital Lease Obligations Including Solar Energy Systems Financing, Current	281.3	'	101.2
Long Term Debt And Capital Lease Obligations Including Solar Energy Systems Financing	2,837	'	2,267.10
Solar Energy [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Short-term Debt	56.5	'	'
Short-term Debt, Weighted Average Interest Rate	'	8.00%	6.50%
Capital Lease Obligations, Current	7.1	'	7.5
Capital Lease Obligations, Noncurrent	129.7	'	85.8
Sale Leaseback Transaction, Amount Due under Financing Arrangement	1,169.60	'	1,107.20
Financing Obligations, Current	12.9	'	14.3
Long-term Finance Obligations	1,156.70	'	1,092.90
Other System Financing transactions	120.8	'	119.7
Other system financing transactions, current	0	'	0
Other system financing transactions, noncurrent	120.8	'	119.7
Long Term Solar Energy Systems Financing And Capital Leases	2,342.50	'	1,606.20
Short Term Solar Energy System Financing And Current Portion Of Long Term Solar Energy System Financing And Capital Lease Obligations	261.6	'	97.8
Long-term solar energy system financing and capital lease obligations, less current portion, including consolidated variable interest entities	2,080.90	'	1,508.40
Construction and Term Debt [Member] \| Solar Energy [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Short-term Debt	0	'	0
Long-term Debt	858.8	'	271.3
Long-term Debt, Current Maturities	185.1	'	61.3
Long-term Debt, Excluding Current Maturities	673.7	'	210
SunEdison [Member] \| Solar Energy [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Capital Lease Obligations	136.8	'	93.3
Construction and Term Debt [Member] \| Solar Energy [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Short-term Debt	$56.50	'	$14.70
Debt Instrument, Redemption, Period Three [Member] \| Second Lien Credit Agreement [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Debt Instrument, Call Premium, Percentage	'	2.00%	'

Debt_and_Capital_Lease_Obligat3

Debt and Capital Lease Obligations (Non-solar Energy System Debt and Capital Leases) (Details) (USD $)

3 Months Ended

9 Months Ended

0 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Mar. 31, 2013

Dec. 31, 2012

Mar. 10, 2011

Sep. 28, 2012

Mar. 10, 2011

8-May-12

Mar. 10, 2011

8-May-12

Mar. 31, 2013

Senior Notes [Member]

Second Lien Credit Agreement [Member]

Maximum [Member]

Minimum [Member]

Debt Instrument, Redemption, Period Three [Member]

EBITDA less than 400 million [Member]

EBITDA, 400 million to 600 million [Member]

EBITDA, 600 million to 850 million [Member]

EBITDA greater than 850 million [Member]

Subsidiary of Common Parent [Member]

Senior Notes [Member]

Second Lien Credit Agreement [Member]

Senior Notes [Member]

Second Lien Credit Agreement [Member]

Debt Instrument [Line Items]

Ratio of Indebtedness to Net Capital

Interest Costs Capitalized

$6.30

$4.30

$12.90

$15.70

Senior notes, issued amount

3,118.30

2,368.30

550

200

Proceeds from second lien term loan

196

Senior note, interest rate

7.75%

Debt issuance costs

13.8

10.8

Debt issuance costs, amortized period (in years)

'8 years

Senior notes sold at a fixed percentage of the principal amount

100.00%

Number Of Days, Notice To Redeem Note

'60 days

'30 days

Debt Instrument Redemption Period

'12 months

Notes Payable, Noncurrent

9.5

12.6

12.5

Debt Instrument, Call Premium, Percentage

2.00%

Debt Instrument, Expected Liquidity Covenant, Minimum

400

200

Debt Instrument, Covenant Compliance, EBITDA, Minimum

400

300

600

Debt Instrument, Covenant Compliance, EBITDA, Maximum

$850

Debt_and_Capital_Lease_Obligat4

Debt and Capital Lease Obligations (Solar Energy System Debt, Financings and Capital Leaseback Obligations) (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Dec. 31, 2012

Mar. 22, 2011

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2013

Mar. 31, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2011

Sep. 30, 2013

Jun. 27, 2012

Sep. 30, 2013

Sep. 24, 2012

Mar. 31, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Mar. 31, 2013

Solar Energy [Member]

Corporate Credit Facility [Member]

Construction Financing Revolver [Member]

Finance Obligations Under Sale Leaseback [Member]

SunEdison [Member]

SunEdisons Subsidiary One [Member]

SunEdison Subsidiary Three [Member]

SunEdisons Subsidiary Two [Member]

Construction and Term Debt [Member]

Other System Financing [Member]

Maximum [Member]

Minimum [Member]

Solar Energy [Member]

Construction Financing Revolver [Member]

Solar Energy [Member]

Corporate Credit Facility [Member]

SunEdison [Member]

Solar Energy [Member]

Debt Instrument [Line Items]

Interest Costs, Capitalized During Period

$6.30

$4.30

$12.90

$15.70

Short-term Debt

56.5

Non Recourse Debt

2,294.50

118.9

Line of Credit, Term

'3 years

Line of Credit Facility, Maximum Borrowing Capacity

400

Line of Credit Facility, Percent Of Outstanding Balance Required To Post Under Covenant Terms

15.00%

Line of Credit Facility, Amount Outstanding

47.5

7.4

Long-term Debt

858.8

271.3

Long-term Debt, Percentage Bearing Variable Interest, Amount

368.2

Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum

3.00%

Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum

18.00%

Pledged Assets, Other, Not Separately Reported on Statement of Financial Position

1,186.50

105.5

Long-term Debt, Current Maturities

185.1

61.3

Sales Leaseback Transaction, Capacity

120

102

Capital Lease Obligations

136.8

93.3

FAS 13 - Economic Useful Life Test

75.00%

Sale Leaseback Transaction, Amount Due under Financing Arrangement

1,169.60

1,107.20

1,169.60

101.8

55.9

Sale leaseback transaction, amount available under financing arrangment

46.1

Sale Leaseback Transaction Master Lease Agreements Term

'25 years

'10 years

Sale and Lease Back Available Amount

18.2

Debt, proceeds collected under sales agreement, current

Debt, proceeds collected from sales agreement, noncurrent

$102.80

Ratio of Indebtedness to Net Capital

2.5

Debt_and_Capital_Lease_Obligat5

Debt and Capital Lease Obligations (Other Facilities) (Details) (USD $)

3 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Feb. 28, 2012

Mar. 22, 2011

Sep. 28, 2012

Mar. 31, 2013

8-May-12

Mar. 31, 2013

8-May-12

Mar. 31, 2013

Mar. 31, 2012

Mar. 31, 2013

Corporate Credit Facility [Member]

Second Lien Credit Agreement [Member]

Maximum [Member]

Minimum [Member]

EBITDA less than 400 million [Member]

EBITDA, 400 million to 600 million [Member]

EBITDA, 600 million to 850 million [Member]

EBITDA greater than 850 million [Member]

Debt Instrument, Redemption, Period Three [Member]

Corporate Credit Facility [Member]

Second Lien Credit Agreement [Member]

Corporate Credit Facility [Member]

Second Lien Credit Agreement [Member]

Corporate Credit Facility [Member]

Second Lien Credit Agreement [Member]

Corporate Credit Facility [Member]

Second Lien Credit Agreement [Member]

Corporate Credit Facility [Member]

Second Lien Credit Agreement [Member]

Corporate Credit Facility [Member]

Second Lien Credit Agreement [Member]

Debt Instrument [Line Items]

SunEdison Non Recourse Construction Revolver Capacity

$150

Senior notes, issued amount

3,118.30

2,368.30

200

Line of Credit Facility, Maximum Borrowing Capacity

400

Debt Instrument, Expected Liquidity Covenant, Minimum

410.6

500

400

200

300

Consolidated Leverage Ratio

Debt Instrument, Covenant Compliance, EBITDA, Maximum

600

850

Debt Instrument, Covenant Compliance, EBITDA, Minimum

400

300

600

Line of Credit Facility, Interest Rate Increase

0.25%

Line of Credit, Term

'3 years

Debt issuance costs

10.8

Ratio of Indebtedness to Net Capital

2.5

Debt Instruments, Cross Default Clause, Minimum Default Indebtedness Amount

Line of Credit Facility, Amount Outstanding

Letters of Credit Outstanding, Amount

229.7

121.8

Line of Credit Facility, Remaining Borrowing Capacity

200

170.3

278.2

Short Term Committed Financing Arrangements Maximum Amount

31.9

Short Term Committed Financing Arrangements Outstanding Amount

Short Term Committed Financing Arrangements Unavailable Amount Due to Third Party Letters of Credit

10.5

Interest Costs, Capitalized During Period

6.3

4.3

12.9

15.7

Debt Instrument, Call Premium, Percentage

2.00%

Proceeds from second lien term loan

$196

Debt Instrument, Interest Rate at Period End

10.75%

Derivatives_and_Hedging_Instru2

Derivatives and Hedging Instruments (Derivatives and Hedging Activities) (Details) (USD $)	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]	'	'	'
Equity Method Investment, Ownership Percentage	8.20%	'	'
Line of Credit Facility, Remaining Borrowing Capacity	$200	'	'
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	91.80%	'	'
Notional Amount of Interest Rate Derivatives	200	'	'
Derivative, Cap Interest Rate	1.50%	'	'
Senior notes, issued amount	'	3,118.30	2,368.30
Accrued Liabilities [Member] \| Derivatives Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Assets (Liabilities or Equity) Fair Value	-28.6	'	-5
Accrued Liabilities [Member] \| Derivatives Designated as Hedging Instrument [Member] \| Currency Swap [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Assets (Liabilities or Equity) Fair Value	-7.8	'	0
Accrued Liabilities [Member] \| Derivatives Not Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Assets (Liabilities or Equity) Fair Value	-0.4	'	0
Accrued Liabilities [Member] \| Derivatives Not Designated as Hedging Instrument [Member] \| Forward Contracts [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Assets (Liabilities or Equity) Fair Value	-1.4	'	-7.1
Accumulated Other Comprehensive Income (Loss) [Member] \| Derivatives Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Assets (Liabilities or Equity) Fair Value	2.3	'	4.3
Accumulated Other Comprehensive Income (Loss) [Member] \| Derivatives Designated as Hedging Instrument [Member] \| Currency Swap [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Assets (Liabilities or Equity) Fair Value	7.8	'	0
Accumulated Other Comprehensive Income (Loss) [Member] \| Derivatives Designated as Hedging Instrument [Member] \| Interest Rate Cap [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Assets (Liabilities or Equity) Fair Value	-0.2	'	0
Prepaid and Other Current Assets [Member] \| Derivatives Designated as Hedging Instrument [Member] \| Interest Rate Cap [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Assets (Liabilities or Equity) Fair Value	0.2	'	0
Prepaid and Other Current Assets [Member] \| Derivatives Not Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Assets (Liabilities or Equity) Fair Value	0.1	'	0
Prepaid and Other Current Assets [Member] \| Derivatives Not Designated as Hedging Instrument [Member] \| Forward Contracts [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Assets (Liabilities or Equity) Fair Value	1.7	'	0.5
Other Assets [Member] \| Derivatives Not Designated as Hedging Instrument [Member] \| Suntech Warrant [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Assets (Liabilities or Equity) Fair Value	$0.20	'	$0.20

Derivatives_and_Hedging_Instru3

Derivatives and Hedging Instruments (Derivative Instruments, Gain (Loss) in Statement of Operations) (Details) (USD $)	3 Months Ended		9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012
Suntech Warrant [Member] \| Derivatives Not Designated as Hedging Instrument [Member] \| Other, Net [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments (Gains) Losses Recognized in Statement of Operations Location	($0.20)	$0.20	$0	$0.40
Forward Contracts [Member] \| Derivatives Not Designated as Hedging Instrument [Member] \| Other, Net [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments (Gains) Losses Recognized in Statement of Operations Location	4.3	7.6	-6.2	6.4
Interest Rate Swap [Member] \| Derivatives Not Designated as Hedging Instrument [Member] \| Other, Net [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments (Gains) Losses Recognized in Statement of Operations Location	-1.1	0	-1.4	0
Derivative Noncontrolling Interest Income [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Income (Loss) Attributable to Noncontrolling Interest	$0	'	'	'

Derivatives_and_Hedging_Instru4

Derivatives and Hedging Instruments (Narrative) (Details) (USD $)	3 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
South Africa Swap [Line Items]	'	'
Foreign Currency Transaction Gain (Loss), before Tax	$0.70	'
Currency forward contracts, net notional amounts	353,800,000	320,500,000
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives	185,800,000	'
Notional amount of interest rate cash flow hedge	178,400,000	40,700,000
Loss on cash flow hedge ineffectiveness	0	'
Derivative Noncontrolling Interest Income [Member]	'	'
South Africa Swap [Line Items]	'	'
Income (Loss) Attributable to Noncontrolling Interest	$0	'

Fair_Value_Measurements_Financ

Fair Value Measurements (Financial Instruments Measured at Fair Value on Recurring Basis) (Details) (USD $)

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

In Millions, unless otherwise specified

Estimate of Fair Value, Fair Value Disclosure [Member]

Fair Value Measurements, Recurring [Member]

Interest Rate Cap [Member]

Level 1 [Member]

Fair Value, Inputs, Level 2 [Member]

Level 3 [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Interest Rate Swap [Member]

Interest Rate Cap [Member]

Forward Contracts [Member]

Contingent Consideration Related to Acquisitions [Member]

Interest Rate Swap [Member]

Forward Contracts [Member]

Available-for-sale Securities [Member]

Suntech Warrant [Member]

Currency Swap [Member]

Derivatives Designated as Hedging Instrument [Member]

Level 1 [Member]

Fair Value, Inputs, Level 2 [Member]

Level 3 [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Level 1 [Member]

Fair Value, Inputs, Level 2 [Member]

Level 3 [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Level 1 [Member]

Fair Value, Inputs, Level 2 [Member]

Level 3 [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Level 1 [Member]

Fair Value, Inputs, Level 2 [Member]

Level 3 [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Level 1 [Member]

Fair Value, Inputs, Level 2 [Member]

Level 3 [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Level 1 [Member]

Fair Value, Inputs, Level 2 [Member]

Level 3 [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Level 1 [Member]

Fair Value, Inputs, Level 2 [Member]

Level 3 [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Level 1 [Member]

Fair Value, Inputs, Level 2 [Member]

Level 3 [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Level 1 [Member]

Fair Value, Inputs, Level 2 [Member]

Level 3 [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Prepaid and Other Current Assets [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Debt Instrument, Face Amount

$3,118.30

$2,368.30

Debt Instrument, Fair Value Disclosure

2,721.70

1,736.20

Assets, Fair Value Disclosure

-1.4

-6.6

-1.4

-6.6

1.7

14.3

13.4

14.3

13.4

0.2

-7.8

Liabilities, Fair Value Disclosure

-29

-5

-29

-5

-50.4

-24.9

-50.4

-24.9

0.1

Derivative, Fair Value, Net

0.2

Assets (Liabilities) FV Disclosure

$0.30

($6.60)

($22.20)

$8.40

($50.20)

($24.70)

($72.10)

($22.90)

Fair_Value_Measurements_Change

Fair Value Measurements (Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) (USD $)	3 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2013		Sep. 30, 2012
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'		'
Beginning Balance	($24.70)	($24.70)		($90.30)
Total unrealized gains (losses) included in earnings	'	-3.1	[1]	-11.9	[1]
Acquisitions, sales, redemptions and maturities	'	-22.4		67.3
Ending Balance	'	-50.2		-34.9
Fair Value Assets And Liabilities Measured On Recurring Basis Unrealized Gain Loss Included In Earnings	-3.1	'		'
Contingent Consideration Related to Acquisitions [Member]	'	'		'
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'		'
Beginning Balance	-24.9	-24.9		-90.8
Total unrealized gains (losses) included in earnings	'	-3.1	[1]	-11.5	[1]
Acquisitions, sales, redemptions and maturities	'	-22.4		67.3
Ending Balance	'	-50.4		-35
Fair Value Assets And Liabilities Measured On Recurring Basis Unrealized Gain Loss Included In Earnings	-3.1	'		'
Suntech Warrant [Member]	'	'		'
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'		'
Beginning Balance	0.2	0.2		0.5
Total unrealized gains (losses) included in earnings	'	0	[1]	-0.4	[1]
Acquisitions, sales, redemptions and maturities	'	0		0
Ending Balance	'	0.2		0.1
Fair Value Assets And Liabilities Measured On Recurring Basis Unrealized Gain Loss Included In Earnings	$0	'		'

[1]	Amounts included in earnings are recorded to non-operating expense (income) in the condensed consolidated statement of operations, except for the amount included in marketing and administration for the contingent consideration related to acquisitions, for which changes to the fair value were recorded to operating income (loss) in the condensed consolidated statement of operations.

Fair_Value_Measurements_Narrat

Fair Value Measurements (Narrative) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013	Dec. 31, 2012	Mar. 10, 2011
In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Estimate of Fair Value, Fair Value Disclosure [Member]	Estimate of Fair Value, Fair Value Disclosure [Member]	Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'	'
Debt Instrument, Fair Value Disclosure	'	'	$2,721.70	$1,736.20	'
Senior notes, issued amount	$3,118.30	$2,368.30	'	'	$550

Income_loss_Per_Share_Details

Income (loss) Per Share (Details) (USD $)	3 Months Ended				6 Months Ended	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 18, 2013
Equity Offering Shares	'	'	'	'	'	'	'	34,500,000
TemporaryEquityAccretionToRedemptionValueAdjustment QTD Basic EPS	$2.40	$0.90	'	'	'	$6.80	$0.90	'
Net (loss) income attributable to SunEdison stockholders	-108	37	77.2	98.6	175.8	-300.3	-138.8	'
Adjusted net income to common stockholders, basic	-110.4	36.1	'	'	'	-307.1	-139.7	'
Adjusted net income to common stockholders, diluted	-110.4	36.1	'	'	'	-307.1	-139.7	'
Weighted-average shares outstanding (in shares)	236,900,000	230,900,000	'	'	'	233,300,000	230,800,000	'
Total shares (in shares)	236,900,000	230,900,000	'	'	'	233,300,000	230,800,000	'
Stock Issued During Period, Value, Restricted Stock Award, Gross	0	'	'	'	'	'	'	'
Income (loss) per share, basic (in dollars per share)	($0.47)	$0.16	'	'	'	($1.32)	($0.61)	'
Earnings Per Share, Diluted	($0.47)	$0.16	'	'	'	($1.32)	($0.61)	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	'	31,700,000	'	'	'	'	'	'
Earnings Per Share, Basic [Member]	'	'	'	'	'	'	'	'
Stock Issued During Period, Value, Restricted Stock Award, Gross	'	0	'	'	'	'	'	'
Earnings Per Share, Diluted [Member]	'	'	'	'	'	'	'	'
Stock Issued During Period, Value, Restricted Stock Award, Gross	'	1.1	'	'	'	'	'	'
Parent [Member]	'	'	'	'	'	'	'	'
TemporaryEquityAccretionToRedemptionValueAdjustment QTD Basic EPS	'	'	'	'	'	$6.80	'	'

Stockholders_Equity_Changes_in

Stockholders' Equity (Changes in Stockholders Equity) (Details) (USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Stockholders Equity [Line Items]	'	'	'	'	'	'
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	5.6	16.5	'	'	'	'
Balance	'	'	'	$666.10	'	'
Net loss	-112.1	'	38.4	-309.9	-137	'
Net (loss) income	'	'	'	-306.7	'	'
SunEdison - distributions to partner	'	'	'	22.4	'	'
Stock Issued During Period, Value, Other	'	'	'	239.6	'	'
Deconsolidation, Gain (Loss), Amount	'	'	'	-6.1	'	'
SunEdison - contributions from partner	'	'	'	16.7	'	'
Balance	583.5	'	'	583.5	'	'
Temporary Equity, Foreign Currency Translation Adjustments	'	'	'	0	'	'
Temporary Equity, Accretion to Redemption Value, Adjustment	-2.4	'	-0.9	-6.8	-0.9	'
Reclassification of Redeemable Non Controlling Interest to Liability	'	'	'	0	'	'
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	'	'	'	-3	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	'	'	'	38.7	'	'
Increase (Decrease) in Temporary Equity [Roll Forward]	'	'	'	'	'	'
Redeemable noncontrolling interest	0	'	'	0	'	11.3
Net (loss) income	'	'	'	-3.2	'	'
SunEdison - contributions from partner	'	'	'	0	'	'
Parent [Member]	'	'	'	'	'	'
Stockholders Equity [Line Items]	'	'	'	'	'	'
Balance	'	'	'	575.3	'	'
Net loss	'	'	'	-300.3	'	'
Stock plans, net	'	'	'	-22.4	'	'
Stock Issued During Period, Value, Other	'	'	'	239.6	'	'
Deconsolidation, Gain (Loss), Amount	'	'	'	0.1	'	'
SunEdison - contributions from partner	'	'	'	0.6	'	'
Balance	487	'	'	487	'	'
Temporary Equity, Accretion to Redemption Value, Adjustment	'	'	'	-6.8	'	'
Reclassification of Redeemable Non Controlling Interest to Liability	'	'	'	0	'	'
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	'	'	'	-3	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	'	'	'	40.9	'	'
Noncontrolling Interest [Member]	'	'	'	'	'	'
Stockholders Equity [Line Items]	'	'	'	'	'	'
Balance	'	'	'	90.8	'	'
Net loss	'	'	'	-6.4	'	'
Stock plans, net	'	'	'	0	'	'
SunEdison - distributions to partner	'	'	'	0	'	'
Stock Issued During Period, Value, Other	'	'	'	0	'	'
Deconsolidation, Gain (Loss), Amount	'	'	'	-6.2	'	'
Deconsolidation, Revaluation of Retained Investment, Gain (Loss), Amount	'	'	'	0	'	'
SunEdison - contributions from partner	'	'	'	16.1	'	'
Balance	96.5	'	'	96.5	'	'
Temporary Equity, Accretion to Redemption Value, Adjustment	'	'	'	0	'	'
Reclassification of Redeemable Non Controlling Interest to Liability	'	'	'	0	'	'
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	'	'	'	0	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	'	'	'	-2.2	'	'
Redeemable noncontrolling interest [Domain]	'	'	'	'	'	'
Stockholders Equity [Line Items]	'	'	'	'	'	'
Stock Issued During Period, Value, Other	'	'	'	0	'	'
Temporary Equity, Accretion to Redemption Value, Adjustment	'	'	'	6.8	'	'
Reclassification of Redeemable Non Controlling Interest to Liability	'	'	'	($14.90)	'	'

Stockholders_Equity_Narrative_

Stockholders' Equity (Narrative) (Details) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

In Millions, except Share data, unless otherwise specified

Sep. 30, 2013

Jun. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 24, 2013

Sep. 18, 2013

Jun. 27, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Stock Options [Member]

Restricted Stock Units (RSUs) [Member]

Common Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Offering Shares

34,500,000

Common Stock, Shares Authorized

300,000,000

5,200,000

Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners

91.80%

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

$3.99

$1.18

Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period

2,550,469

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value

$8.74

$3.09

Stock or Unit Option Plan Expense

$8.80

$7.50

$22.60

$21.90

Granted (in shares)

5,778,183

Common Stock, Par or Stated Value Per Share

$0.01

Sale of Stock, Price Per Share

$7.25

Equity Offering stock price discounts & commissions

$0.29

Proceeds from Issuance or Sale of Equity

239.6

Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures

5,600,000

16,500,000

Redeemable Noncontrolling Interest, Equity, Carrying Amount

11.3

10.4

IFC Ownership Percentage

15.00%

Temporary Equity, Redemption Value

14.9

Temporary Equity adjustment to retained earnings

$2.40

Stockholders_Equity_Outstandin

Stockholders' Equity (Outstanding Stock Options) (Details) (USD $)	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'
Outstanding shares, beginning balance	21,411,119
Granted (in shares)	5,778,183
Exercised	-183,102
Forfeited	-2,550,469
Expired	-431,628
Outstanding shares, ending balance	24,024,103
Stock Options Exercisable	4,546,599
Weighted Average Exercise Price, Beginning balance	$6.12
Granted, Weighted Average Exercise Price	$8.74
Exercised, Weighted Average Exercise Price	$3.02
Forfeited, Weighted Average Exercise Price	$5.66
Expired, Weighted Average Exercise Price	$20.01
Weighted Average Exercise Price, Ending balance	$6.57
Stock Options Exercisable, Weighted Average Exercise Price	$12.27
Outstanding, Aggregate Intrinsic Value	$73.50
Exercisable, Aggregate Intrinsic Value	$6.60
Outstanding, Weighted Average Remaining Contractual Life, years	'8 years
Exercisable, Weighted Average Remaining Contractual Life (in years)	'6 years

Stockholders_Equity_Outstandin1

Stockholders' Equity (Outstanding Restricted Stock) (Details) (Restricted Stock Units (RSUs) [Member], USD $)	3 Months Ended	9 Months Ended
	Mar. 31, 2013	Sep. 30, 2013
Restricted Stock Units (RSUs) [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]	'	'
Outstanding	4,401,768	4,401,768
Granted	'	1,304,560
Converted	'	-852,204
Forfeited	'	-641,828
Outstanding	'	4,212,296
Outstanding, Aggregate Intrinsic Value	'	$35,800,000
Outstanding, Weighted Average Remaining Contractual Life, years	'2 years	'

Comprehesive_Income_Details

Comprehesive Income (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Gain/(loss) on Hedging Instruments [Line Items]	'	'	'	'	'
Net foreign currency translation adjustment	$13.70	$13.50	($38.70)	$2.70	'
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	-6.7	'	-6.7	'	-7.6
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	-10.1	'	-10.1	'	-4.3
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	-58.3	'	-58.3	'	-60.2
Net translation adjustment	'	'	-40.9	'	'
Net unrealized gain (loss) on available-for-sale securities	0.8	-2.8	0.9	-1.5	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax, Post AOCI Reclass	'	'	-5.8	'	'
Actuarial gain (loss) and amortization of prior service cost	1.9	0.2	1.9	-8.9	'
Other Comprehensive Income Loss Net Of Tax Including Noncontrolling Interest, Post AOCI Adj	'	'	-43.9	'	'
Other Comprehensive Income Loss Net Of Tax Including Noncontrolling Interest	'	'	-43.5	'	'
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-8.6	'	-8.6	'	32.3
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	9.7	-0.7	-5.4	-0.8	'
Accumulated other comprehensive loss	-83.7	'	-83.7	'	-39.8
Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment, net of tax, including NCI	'	'	-40.9	'	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	-9.7	0.7	5.8	0.8	'
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	1.9	'	1.9	'	'
Other Comprehensive Income, Other, Net of Tax	26.1	10.2	-41.7	-8.5	'
Gain/(loss) on hedging instrument [Domain]	'	'	'	'	'
Gain/(loss) on Hedging Instruments [Line Items]	'	'	'	'	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	9.7	'	-5.4	'	'
Gain/(loss) on settlement of hedging instrument [Domain]	'	'	'	'	'
Gain/(loss) on Hedging Instruments [Line Items]	'	'	'	'	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	0	'	-0.4	'	'
Foreign Currency Gain (Loss) [Member]	'	'	'	'	'
Gain/(loss) on Hedging Instruments [Line Items]	'	'	'	'	'
Amount reclassified from AOCI	'	'	0	'	'
Available-for-sale Securities [Member]	'	'	'	'	'
Gain/(loss) on Hedging Instruments [Line Items]	'	'	'	'	'
Amount reclassified from AOCI	'	'	0	'	'
Cash Flow Hedging [Member]	'	'	'	'	'
Gain/(loss) on Hedging Instruments [Line Items]	'	'	'	'	'
Amount reclassified from AOCI	'	'	-0.4	'	'
Pension Plans, Defined Benefit [Member]	'	'	'	'	'
Gain/(loss) on Hedging Instruments [Line Items]	'	'	'	'	'
Amount reclassified from AOCI	'	'	0	'	'
OCI-Foreign Currency Translation Adj (incl. portion related to NCI) [Member]	'	'	'	'	'
Gain/(loss) on Hedging Instruments [Line Items]	'	'	'	'	'
Net foreign currency translation adjustment	8.9	'	-40.9	'	'
Other Comprehensive Income, Other, Net of Tax	21.3	'	-43.9	'	'
Accumulated Other Comprehensive Income (Loss) [Member]	'	'	'	'	'
Gain/(loss) on Hedging Instruments [Line Items]	'	'	'	'	'
Amount reclassified from AOCI	'	'	($0.40)	'	'

Income_Taxes_Details

Income Taxes (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Adjustment for IRS Exam Settlement [Line Items]	'	'
Deferred Tax Assets, Net	$45.50	$84.90
Increase Of Total Reserve For Uncertain Tax Positions	36.2	'
Total reserve for uncertain tax positions	17	53.2
Income Tax Reconciliation, Repatriation of Foreign Earnings	67.4	'
Cash Cash Equivalents Short term Investments Subject To Repatriation Tax Effect	396.8	'
Tax Adjustments, Settlements, and Unusual Provisions	11.8	'
Revenue Subject to Refund [Member]	'	'
Adjustment for IRS Exam Settlement [Line Items]	'	'
Tax Adjustments, Settlements, and Unusual Provisions	1	'
Segment, Operating Activities	'	'
Adjustment for IRS Exam Settlement [Line Items]	'	'
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	7.8	'
General Business Tax Credit Carryforward [Member]	'	'
Adjustment for IRS Exam Settlement [Line Items]	'	'
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	33.2	'
Interest Expense [Member]	'	'
Adjustment for IRS Exam Settlement [Line Items]	'	'
Tax Adjustments, Settlements, and Unusual Provisions	1.9	'
Net, Penalty	'	'
Adjustment for IRS Exam Settlement [Line Items]	'	'
Tax Adjustments, Settlements, and Unusual Provisions	$9.60	'

Income_Taxes_Tax_assessment_De

Income Taxes Tax assessment (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Income Tax Examination [Line Items]	'
Tax Adjustments, Settlements, and Unusual Provisions	$11.80
Interest Expense [Member]	'
Income Tax Examination [Line Items]	'
Tax Adjustments, Settlements, and Unusual Provisions	1.9
Revenue Subject to Refund [Member]	'
Income Tax Examination [Line Items]	'
Tax Adjustments, Settlements, and Unusual Provisions	$1

Variable_Interest_Entities_Det

Variable Interest Entities (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]	'	'
Current assets	$325.10	$10.30
Noncurrent assets	329.8	56.2
Total assets	654.9	66.5
Current liabilities	-121.3	-8.5
Noncurrent liabilities	-449.4	-69.6
Total liabilities	($570.70)	($78.10)
Variable Interest Entity, Primary Beneficiary [Member]	'	'
Variable Interest Entity [Line Items]	'	'
Variable Interest Entity, Number Of Entities	10	'

Deferred_Revenue_and_Profit_De

Deferred Revenue and Profit (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Deferred Revenue Arrangement [Line Items]	'	'
Deferred revenue for solar energy systems	$120.20	$113.10
Deferred Revenue	225.4	288.3
Deferred Revenue, Current	0	0
Solar Energy [Member]	'	'
Deferred Revenue Arrangement [Line Items]	'	'
Profit deferrals on solar energy system sales	-82.1	-126.4
Deferred subsidy revenue	19.6	19.6
Deferred Revenue	221.9	259.1
Non-Solar Energy Systems [Member]	'	'
Deferred Revenue Arrangement [Line Items]	'	'
Deferred Revenue	3.5	29.2
Long-term deferred revenue	$3.50	$29.20

Deferred_Revenue_and_Profit_De1

Deferred Revenue and Profit Deferred Revenue & Profit (Narrative) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2013	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2013
In Millions, unless otherwise specified			Gintech [Member]	Gintech [Member]	Tainergy [Member]	Conergy [Member]	Conergy [Member]	deferred revenue recognized [Member]	Refundable [Member]	Received in current period [Member]
								Gintech [Member]	Conergy [Member]	Conergy [Member]
Deferred Revenue Arrangement [Line Items]	'	'	'	'	'	'	'	'	'	'
Customer Advances and Deposits	'	'	'	$21.90	'	'	$21.30	'	$26.70	'
Cash paid to settle supply agreement	'	'	'	'	'	3	'	'	'	2
Total deferred revenue	'	'	22	'	25	37.1	'	0.9	'	'
Payments to vendors for refundable deposits on long-term agreements	'	'	35.1	'	'	'	'	'	'	'
Deferred revenue for solar energy systems	$101.70	$146	'	'	'	'	'	'	'	'

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)

3 Months Ended

6 Months Ended

9 Months Ended

3 Months Ended

0 Months Ended

9 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Jun. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Sep. 30, 2013

Mar. 31, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Mar. 31, 2013

Sep. 04, 2012

Sep. 30, 2013

Dec. 31, 2012

SunEdison [Member]

Contract Termination [Member]

Purchase Obligation Termination [Member]

2011 Global Plan [Member]

SMP JV [Member]

Purchase Obligation Termination [Member]

Maximum [Member]

Contract Termination [Member]

Loss Contingencies [Line Items]

Net loss attributable to SunEdison stockholders

($108)

$37

$77.20

$98.60

$175.80

($300.30)

($138.80)

Equity Method Investment, Ownership Percentage

8.20%

50.00%

Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners

91.80%

50.00%

Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures

40.6

96.9

Equity Method Investments

175

Litigation Settlement, Gross

Payments for Legal Settlements

Customer and other deposits

165.4

184.5

60.2

Equity Method Investment, Aggregate Cost

Restructuring Reserve

40.1

96.8

204.5

40.1

134.5

Restructuring Reserve, Current

9.7

Restructuring Reserve, Noncurrent

30.4

Loss Contingency, Range of Possible Loss, Maximum

166

Business Acquisition, Contingent Consideration, at Fair Value

26.8

50.4

Contingent consideration related to acquisitions

26.8

23.1

Business Acquisition, Contingent Consideration, at Fair Value, Noncurrent

23.6

Business Acquisition, Contingent Consideration, Potential Cash Payment

$84.30

Reportable_Segments_Narrative_

Reportable Segments (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended		3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2013
	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Solar Energy [Member]	Solar Energy [Member]	Conergy [Member]	Gintech [Member]
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'
Income related to Degussa Settlement	$69.20	'	'	'	'	'	'
Construction Of Solar Energy Systems Capital Expenditures	'	261.3	193.2	138.8	35.5	'	'
Total deferred revenue	'	'	'	'	'	37.1	22
Asset Impairment Charges	$14.20	'	$17.30	'	'	'	'

Reportable_Segments_Schedule_o

Reportable Segments (Schedule of Reportable Segments) (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Mar. 31, 2013

Mar. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Mar. 31, 2013

Semiconductor [Domain]

Solar Energy [Member]

Solar [Domain]

Corporate [Domain]

Tainergy [Member]

Segment Reporting Information [Line Items]

Net sales

$611.50

$601.60

$1,456.40

$1,929.20

$230.70

$240.30

$699.50

$689

$380.80

$361.30

$756.90

$1,240.20

Operating Income (Loss)

-49.1

58.9

-129.2

-10.6

-0.8

8.7

4.2

-8.1

-17.3

75.8

-53.3

70.4

-31

-25.6

-80.1

-72.9

Interest expense

45.2

127.3

100.3

-0.3

-0.9

-0.8

25.1

14.7

60.7

20.1

13.6

61.2

40.4

Depreciation and amortization

70.6

59.1

192.4

168.4

29.4

30.6

90.4

92.6

38.7

26.5

95.7

70.5

2.5

6.3

5.3

Capital expenditures

170.4

59.5

362.5

293.5

17.2

14.6

65.8

55.6

150.4

44.9

291.3

231.3

2.8

5.4

6.6

Construction of solar energy systems

261.3

193.2

138.8

35.5

Recognition of Deferred Revenue

$25

Condensed_Consolidating_Statem1

Condensed Consolidating Statement of Operations (Details) (USD $)	3 Months Ended				6 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	$4.80	$1.10	'	'	'	$2.20	$1
Net sales	611.5	601.6	'	'	'	1,456.40	1,929.20
Cost of goods sold	550.9	514.7	'	'	'	1,296.90	1,701.80
Gross profit	60.6	86.9	'	'	'	159.5	227.4
Marketing and administration	91.1	68.9	'	'	'	240.2	235.2
Research and development	18.6	17.4	'	'	'	54.1	55.8
Restructuring and impairment charges	0	-58.3	'	'	'	-5.6	-53
Operating (loss) income	-49.1	58.9	'	'	'	-129.2	-10.6
Interest expense	45.2	28	'	'	'	127.3	100.3
Interest income	-0.7	-0.9	'	'	'	-2	-2.8
Other, net	5.5	-2.4	'	'	'	9	0.1
Total non-operating expense	50	24.7	'	'	'	134.3	97.6
(Loss) income before income taxes and equity in earnings (loss) of joint venture	-99.1	34.2	'	'	'	-263.5	-108.2
Income tax expense (benefit)	17.1	-3.3	'	'	'	50.2	27.9
(Loss) income before equity in loss of joint ventures	-116.2	37.5	'	'	'	-313.7	-136.1
Investment in subsidiary earnings (loss)	0	0	'	'	'	0	0
Equity in income (loss) of joint ventures, net of tax	4.1	0.9	'	'	'	3.8	-0.9
Net (loss) income	-112.1	38.4	'	'	'	-309.9	-137
Net (income) loss attributable to noncontrolling interests	4.1	-1.4	'	'	'	9.6	-1.8
Net (loss) income attributable to SunEdison stockholders	-108	37	77.2	98.6	175.8	-300.3	-138.8
MEMC, Inc. [Member]	'	'	'	'	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0	0	'	'	'	0	0
Net sales	193.9	189.7	'	'	'	580.8	545.1
Cost of goods sold	208.1	204.1	'	'	'	625.9	586.2
Gross profit	-14.2	-14.4	'	'	'	-45.1	-41.1
Marketing and administration	30.2	26.3	'	'	'	84.9	87.6
Research and development	12.7	11.9	'	'	'	36.4	37.5
Restructuring and impairment charges	0.5	16.2	'	'	'	1.5	15.4
Operating (loss) income	-57.6	-68.8	'	'	'	-167.9	-181.6
Interest expense	22.1	12.4	'	'	'	61.8	35.8
Interest income	0	0	'	'	'	0	-0.1
Other, net	-12.3	-11	'	'	'	-24.1	-39.4
Total non-operating expense	9.8	1.4	'	'	'	37.7	-3.7
(Loss) income before income taxes and equity in earnings (loss) of joint venture	-67.4	-70.2	'	'	'	-205.6	-177.9
Income tax expense (benefit)	-161	-22.2	'	'	'	-225.6	-68.9
(Loss) income before equity in loss of joint ventures	93.6	-48	'	'	'	20	-109
Investment in subsidiary earnings (loss)	-201.6	85	'	'	'	-320.3	-29.8
Equity in income (loss) of joint ventures, net of tax	0	0	'	'	'	0	0
Net (loss) income	-108	37	'	'	'	-300.3	-138.8
Net (income) loss attributable to noncontrolling interests	0	0	'	'	'	0	0
Net (loss) income attributable to SunEdison stockholders	-108	37	'	'	'	-300.3	-138.8
Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0	0	'	'	'	0	0
Net sales	224.8	375.9	'	'	'	385.2	705.5
Cost of goods sold	221.4	410.9	'	'	'	377.4	741.3
Gross profit	3.4	-35	'	'	'	7.8	-35.8
Marketing and administration	23	14.3	'	'	'	62.5	66.8
Research and development	3.5	3.7	'	'	'	9.9	11.3
Restructuring and impairment charges	0.3	-1.1	'	'	'	0.3	2.9
Operating (loss) income	-23.4	-51.9	'	'	'	-64.9	-116.8
Interest expense	5.5	0	'	'	'	13.1	6.1
Interest income	0	0	'	'	'	0	0
Other, net	6.3	17.7	'	'	'	0.3	17.1
Total non-operating expense	11.8	17.7	'	'	'	13.4	23.2
(Loss) income before income taxes and equity in earnings (loss) of joint venture	-35.2	-69.6	'	'	'	-78.3	-140
Income tax expense (benefit)	155.1	-4.6	'	'	'	204.6	60.9
(Loss) income before equity in loss of joint ventures	-190.3	-65	'	'	'	-282.9	-200.9
Investment in subsidiary earnings (loss)	-83.5	80.6	'	'	'	-191.2	6.9
Equity in income (loss) of joint ventures, net of tax	0	0	'	'	'	0	0
Net (loss) income	-273.8	15.6	'	'	'	-474.1	-194
Net (income) loss attributable to noncontrolling interests	-0.5	-0.4	'	'	'	-0.8	-0.8
Net (loss) income attributable to SunEdison stockholders	-274.3	15.2	'	'	'	-474.9	-194.8
Non-Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	4.8	1.1	'	'	'	2.2	1
Net sales	952.5	667.2	'	'	'	2,262.90	2,288.70
Cost of goods sold	778.5	577.2	'	'	'	2,005.40	2,020
Gross profit	174	90	'	'	'	257.5	268.7
Marketing and administration	37.9	28.3	'	'	'	92.8	80.8
Research and development	2.4	1.8	'	'	'	7.8	7
Restructuring and impairment charges	-0.8	-73.4	'	'	'	-7.4	-71.3
Operating (loss) income	134.5	133.3	'	'	'	164.3	252.2
Interest expense	17.6	15.6	'	'	'	52.4	58.4
Interest income	-0.7	-0.9	'	'	'	-2	-2.7
Other, net	11.5	-10.8	'	'	'	32.8	14.6
Total non-operating expense	28.4	3.9	'	'	'	83.2	70.3
(Loss) income before income taxes and equity in earnings (loss) of joint venture	106.1	129.4	'	'	'	81.1	181.9
Income tax expense (benefit)	22.8	24.8	'	'	'	70	35.9
(Loss) income before equity in loss of joint ventures	83.3	104.6	'	'	'	11.1	146
Investment in subsidiary earnings (loss)	0	0	'	'	'	0	0
Equity in income (loss) of joint ventures, net of tax	4.1	0.9	'	'	'	3.8	-0.9
Net (loss) income	87.4	105.5	'	'	'	14.9	145.1
Net (income) loss attributable to noncontrolling interests	4.6	-1	'	'	'	10.4	-1
Net (loss) income attributable to SunEdison stockholders	92	104.5	'	'	'	25.3	144.1
Consolidated Entities [Member]	'	'	'	'	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0	0	'	'	'	0	0
Consolidating Adjustments [Member]	'	'	'	'	'	'	'
Net sales	-759.7	-631.2	'	'	'	-1,772.50	-1,610.10
Cost of goods sold	-657.1	-677.5	'	'	'	-1,711.80	-1,645.70
Gross profit	-102.6	46.3	'	'	'	-60.7	35.6
Marketing and administration	0	0	'	'	'	0	0
Research and development	0	0	'	'	'	0	0
Restructuring and impairment charges	0	0	'	'	'	0	0
Operating (loss) income	-102.6	46.3	'	'	'	-60.7	35.6
Interest expense	0	0	'	'	'	0	0
Interest income	0	0	'	'	'	0	0
Other, net	0	1.7	'	'	'	0	7.8
Total non-operating expense	0	1.7	'	'	'	0	7.8
(Loss) income before income taxes and equity in earnings (loss) of joint venture	-102.6	44.6	'	'	'	-60.7	27.8
Income tax expense (benefit)	0.2	-1.3	'	'	'	1.2	0
(Loss) income before equity in loss of joint ventures	-102.8	45.9	'	'	'	-61.9	27.8
Investment in subsidiary earnings (loss)	285.1	-165.6	'	'	'	511.5	22.9
Equity in income (loss) of joint ventures, net of tax	0	0	'	'	'	0	0
Net (loss) income	182.3	-119.7	'	'	'	449.6	50.7
Net (income) loss attributable to noncontrolling interests	0	0	'	'	'	0	0
Net (loss) income attributable to SunEdison stockholders	$182.30	($119.70)	'	'	'	$449.60	$50.70

Condensed_Consolidating_Financ2

Condensed Consolidating Financial Information Condensed Consolidating Statement of Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	($112.10)	$38.40	($309.90)	($137)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	13.7	13.5	-38.7	2.7
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	0.8	-2.8	0.9	-1.5
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	9.7	-0.7	-5.4	-0.8
Other Comprehensive (Loss); prior to AOCI reclassification	26.1	'	-41.3	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	-86	48.6	-351.6	-145.5
Other Comprehensive (Loss); post reclassification	26.1	'	-41.7	'
Net loss (income) attributable to noncontrolling interests	4.1	-1.4	9.6	-1.8
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	-4.8	-1.1	-2.2	-1
Comprehensive loss attributable to SunEdison stockholders	-86.7	46.1	-344.2	-148.3
Actuarial gain (loss) and amortization of prior service cost	1.9	0.2	1.9	-8.9
Other Comprehensive Income, Other, Net of Tax	26.1	10.2	-41.7	-8.5
Reclassification from AOCI	0	'	-0.4	'
MEMC, Inc. [Member]	'	'	'	'
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	-108	37	-300.3	-138.8
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	0.5	0	0.1	0
Other Comprehensive (Loss); prior to AOCI reclassification	2.4	'	2	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	-105.6	37.2	-298.3	-137.2
Other Comprehensive (Loss); post reclassification	2.4	'	2	'
Net loss (income) attributable to noncontrolling interests	0	0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0	0	0	0
Comprehensive loss attributable to SunEdison stockholders	-105.6	37.2	-298.3	-137.2
Actuarial gain (loss) and amortization of prior service cost	1.9	0.2	1.9	1.6
Other Comprehensive Income, Other, Net of Tax	'	0.2	'	1.6
Reclassification from AOCI	0	'	0	'
Guarantor Subsidiaries [Member]	'	'	'	'
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	-273.8	15.6	-474.1	-194
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	0	0	0	0
Other Comprehensive (Loss); prior to AOCI reclassification	0	'	0	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	-273.8	15.6	-474.1	-194
Other Comprehensive (Loss); post reclassification	0	'	0	'
Net loss (income) attributable to noncontrolling interests	-0.5	-0.4	-0.8	-0.8
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0	0	0	0
Comprehensive loss attributable to SunEdison stockholders	-274.3	15.2	-474.9	-194.8
Actuarial gain (loss) and amortization of prior service cost	0	0	0	0
Other Comprehensive Income, Other, Net of Tax	'	0	'	0
Reclassification from AOCI	0	'	0	'
Non-Guarantor Subsidiaries [Member]	'	'	'	'
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	87.4	105.5	14.9	145.1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	13.7	13.5	-38.7	2.7
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	0.8	-2.8	0.9	-1.5
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	9.2	-0.7	-5.5	-0.8
Other Comprehensive (Loss); prior to AOCI reclassification	23.7	'	-43.3	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	111.1	115.5	-28.8	135
Other Comprehensive (Loss); post reclassification	23.7	'	-43.7	'
Net loss (income) attributable to noncontrolling interests	4.6	-1	10.4	-1
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	-4.8	-1.1	-2.2	-1
Comprehensive loss attributable to SunEdison stockholders	110.9	113.4	-20.6	133
Actuarial gain (loss) and amortization of prior service cost	0	0	0	-10.5
Other Comprehensive Income, Other, Net of Tax	'	10	'	-10.1
Reclassification from AOCI	0	'	-0.4	'
Consolidated Entities [Member]	'	'	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	0	0	0	0
Other Comprehensive (Loss); prior to AOCI reclassification	0	'	0	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	182.3	-119.7	449.6	50.7
Other Comprehensive (Loss); post reclassification	0	'	0	'
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0	0	0	0
Comprehensive loss attributable to SunEdison stockholders	182.3	-119.7	449.6	50.7
Actuarial gain (loss) and amortization of prior service cost	0	0	0	0
Other Comprehensive Income, Other, Net of Tax	'	0	'	0
Reclassification from AOCI	0	'	0	'
Consolidating Adjustments [Member]	'	'	'	'
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	182.3	-119.7	449.6	50.7
Net loss (income) attributable to noncontrolling interests	$0	$0	$0	$0

Condensed_Consolidating_Balanc

Condensed Consolidating Balance Sheet (Details) (USD $)	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 27, 2012	Dec. 31, 2011
In Millions, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 27, 2012	Dec. 31, 2011
Assets, Current [Abstract]	'	'	'	'	'	'
Cash and cash equivalents	$640.30	'	$572.60	$609.80	'	$585.80
Restricted cash	117.1	'	72.4	'	'	'
Accounts receivable, net	335.3	'	220.4	'	'	'
Inventories	207.8	'	247.8	'	'	'
Solar energy systems held for development and sale	356.7	'	133.8	'	'	'
Prepaid and other current assets	246.1	'	212.4	'	'	'
Total current assets	1,903.30	'	1,459.40	'	'	'
Investments in subsidiaries	0	'	0	'	'	'
Non Solar Energy Systems Property Plant And Equipment	1,151.80	'	1,213.10	'	'	'
Solar energy systems, net	1,884.90	'	1,459.90	'	'	'
Restricted cash	59	'	50.2	'	'	'
Other assets	566	'	562.7	'	'	'
Total assets	5,565	'	4,745.30	'	'	'
Liabilities, Current [Abstract]	'	'	'	'	'	'
Current portion of long-term debt and short term borrowings	19.7	'	3.4	'	'	'
Short-term solar energy system financing and capital lease obligations, including consolidated variable interest entities of $31.7 and $2.9 in 2013 and 2012, respectively	261.6	'	97.8	'	'	'
Accounts payable	667.5	'	477	'	'	'
Accrued Liabilities, Current	408.6	'	343	'	'	'
Business Acquisition, Contingent Consideration, at Fair Value	26.8	'	'	'	'	'
Deferred revenue for solar energy systems	120.2	'	113.1	'	'	'
Contingent consideration related to acquisitions	26.8	26.8	23.1	'	'	'
Customer deposits	34.8	'	77.2	'	'	'
Intercompany receivable (payable) on ST Notes	0	'	0	'	'	'
Total current liabilities	1,539.20	'	1,134.60	'	'	'
Long-term debt and capital lease obligations, less current portion	756.1	'	758.7	'	'	'
Long-term solar energy system financing and capital lease obligations, less current portion, including consolidated variable interest entities of $364.9 and $69.2 in 2013 and 2012, respectively	2,080.90	'	1,508.40	'	'	'
Customer and other deposits	165.4	'	184.5	'	'	'
Deferred revenue for solar energy systems	101.7	'	146	'	'	'
Non-solar energy system deferred revenue	3.5	'	29.2	'	'	'
Long Term Intercompany Notes Receivable (Payable)	0	'	0	'	'	'
Other liabilities	334.7	'	306.5	'	'	'
Total liabilities	4,981.50	'	4,067.90	'	'	'
Redeemable Noncontrolling Interest, Equity, Carrying Amount	'	'	11.3	'	10.4	'
Redeemable noncontrolling interest	0	'	11.3	'	'	'
Total MEMC stockholders' equity	487	'	575.3	'	'	'
Noncontrolling interests	96.5	'	90.8	'	'	'
Total stockholders' equity	583.5	'	666.1	'	'	'
Total liabilities and stockholders' equity	5,565	'	4,745.30	'	'	'
MEMC, Inc. [Member]	'	'	'	'	'	'
Assets, Current [Abstract]	'	'	'	'	'	'
Cash and cash equivalents	131.5	'	65.1	224.5	'	228.9
Restricted cash	0	'	0	'	'	'
Accounts receivable, net	59.8	'	62	'	'	'
Inventories	22.8	'	18.4	'	'	'
Solar energy systems held for development and sale	0	'	0	'	'	'
Prepaid and other current assets	29.7	'	24.9	'	'	'
Total current assets	243.8	'	170.4	'	'	'
Investments in subsidiaries	110.2	'	498.2	'	'	'
Non Solar Energy Systems Property Plant And Equipment	65	'	57.2	'	'	'
Solar energy systems, net	0	'	0	'	'	'
Restricted cash	0	'	0	'	'	'
Other assets	82.1	'	36.7	'	'	'
Total assets	501.1	'	762.5	'	'	'
Liabilities, Current [Abstract]	'	'	'	'	'	'
Current portion of long-term debt and short term borrowings	0	'	0	'	'	'
Short-term solar energy system financing and capital lease obligations, including consolidated variable interest entities of $31.7 and $2.9 in 2013 and 2012, respectively	0	'	0	'	'	'
Accounts payable	26.2	'	11.9	'	'	'
Accrued Liabilities, Current	17.9	'	32.8	'	'	'
Business Acquisition, Contingent Consideration, at Fair Value	0	'	'	'	'	'
Deferred revenue for solar energy systems	0	'	0	'	'	'
Contingent consideration related to acquisitions	'	'	0	'	'	'
Customer deposits	7.6	'	10.9	'	'	'
Intercompany receivable (payable) on ST Notes	-907.1	'	-651	'	'	'
Total current liabilities	-855.4	'	-595.4	'	'	'
Long-term debt and capital lease obligations, less current portion	746.6	'	746.1	'	'	'
Long-term solar energy system financing and capital lease obligations, less current portion, including consolidated variable interest entities of $364.9 and $69.2 in 2013 and 2012, respectively	0	'	0	'	'	'
Customer and other deposits	156.3	'	87.8	'	'	'
Deferred revenue for solar energy systems	0	'	0	'	'	'
Non-solar energy system deferred revenue	0	'	0	'	'	'
Long Term Intercompany Notes Receivable (Payable)	-68.4	'	-45.4	'	'	'
Other liabilities	35	'	-5.9	'	'	'
Total liabilities	14.1	'	187.2	'	'	'
Redeemable Noncontrolling Interest, Equity, Carrying Amount	'	'	0	'	'	'
Redeemable noncontrolling interest	0	'	'	'	'	'
Total MEMC stockholders' equity	487	'	575.3	'	'	'
Noncontrolling interests	0	'	0	'	'	'
Total stockholders' equity	487	'	575.3	'	'	'
Total liabilities and stockholders' equity	501.1	'	762.5	'	'	'
Guarantor Subsidiaries [Member]	'	'	'	'	'	'
Assets, Current [Abstract]	'	'	'	'	'	'
Cash and cash equivalents	99.3	'	60	75.7	'	58.3
Restricted cash	1.8	'	0	'	'	'
Accounts receivable, net	29.8	'	23.7	'	'	'
Inventories	22.8	'	70.6	'	'	'
Solar energy systems held for development and sale	0	'	0.3	'	'	'
Prepaid and other current assets	49.7	'	40.1	'	'	'
Total current assets	203.4	'	194.7	'	'	'
Investments in subsidiaries	69.3	'	564.2	'	'	'
Non Solar Energy Systems Property Plant And Equipment	282.7	'	294.4	'	'	'
Solar energy systems, net	1.2	'	3	'	'	'
Restricted cash	1.7	'	1.7	'	'	'
Other assets	58.4	'	175.3	'	'	'
Total assets	616.7	'	1,233.30	'	'	'
Liabilities, Current [Abstract]	'	'	'	'	'	'
Current portion of long-term debt and short term borrowings	0	'	0	'	'	'
Short-term solar energy system financing and capital lease obligations, including consolidated variable interest entities of $31.7 and $2.9 in 2013 and 2012, respectively	0.2	'	0.2	'	'	'
Accounts payable	23.2	'	67	'	'	'
Accrued Liabilities, Current	112.6	'	42.5	'	'	'
Business Acquisition, Contingent Consideration, at Fair Value	26.8	'	'	'	'	'
Deferred revenue for solar energy systems	27.3	'	40.7	'	'	'
Contingent consideration related to acquisitions	'	'	23.1	'	'	'
Customer deposits	0.5	'	0.4	'	'	'
Intercompany receivable (payable) on ST Notes	989.3	'	764.3	'	'	'
Total current liabilities	1,179.90	'	938.2	'	'	'
Long-term debt and capital lease obligations, less current portion	0	'	0	'	'	'
Long-term solar energy system financing and capital lease obligations, less current portion, including consolidated variable interest entities of $364.9 and $69.2 in 2013 and 2012, respectively	9.7	'	9.8	'	'	'
Customer and other deposits	0	'	0	'	'	'
Deferred revenue for solar energy systems	30.1	'	45.8	'	'	'
Non-solar energy system deferred revenue	0	'	0	'	'	'
Long Term Intercompany Notes Receivable (Payable)	-94.5	'	-96.2	'	'	'
Other liabilities	10.4	'	112	'	'	'
Total liabilities	1,135.60	'	1,009.60	'	'	'
Redeemable Noncontrolling Interest, Equity, Carrying Amount	'	'	0	'	'	'
Redeemable noncontrolling interest	0	'	'	'	'	'
Total MEMC stockholders' equity	-519.5	'	223.7	'	'	'
Noncontrolling interests	0.6	'	0	'	'	'
Total stockholders' equity	-518.9	'	223.7	'	'	'
Total liabilities and stockholders' equity	616.7	'	1,233.30	'	'	'
Non-Guarantor Subsidiaries [Member]	'	'	'	'	'	'
Assets, Current [Abstract]	'	'	'	'	'	'
Cash and cash equivalents	409.5	'	447.5	309.6	'	298.6
Restricted cash	115.3	'	72.4	'	'	'
Accounts receivable, net	245.7	'	134.7	'	'	'
Inventories	191.1	'	200	'	'	'
Solar energy systems held for development and sale	410.6	'	213.7	'	'	'
Prepaid and other current assets	166.7	'	147.4	'	'	'
Total current assets	1,538.90	'	1,215.70	'	'	'
Investments in subsidiaries	0	'	0	'	'	'
Non Solar Energy Systems Property Plant And Equipment	853	'	913.8	'	'	'
Solar energy systems, net	1,812.20	'	1,361.30	'	'	'
Restricted cash	57.3	'	48.5	'	'	'
Other assets	425.5	'	350.7	'	'	'
Total assets	4,686.90	'	3,890	'	'	'
Liabilities, Current [Abstract]	'	'	'	'	'	'
Current portion of long-term debt and short term borrowings	19.7	'	3.4	'	'	'
Short-term solar energy system financing and capital lease obligations, including consolidated variable interest entities of $31.7 and $2.9 in 2013 and 2012, respectively	261.4	'	97.6	'	'	'
Accounts payable	618.1	'	398.1	'	'	'
Accrued Liabilities, Current	278.1	'	267.7	'	'	'
Business Acquisition, Contingent Consideration, at Fair Value	0	'	'	'	'	'
Deferred revenue for solar energy systems	92.9	'	72.4	'	'	'
Contingent consideration related to acquisitions	'	'	0	'	'	'
Customer deposits	26.7	'	65.9	'	'	'
Intercompany receivable (payable) on ST Notes	-82.2	'	-113.3	'	'	'
Total current liabilities	1,214.70	'	791.8	'	'	'
Long-term debt and capital lease obligations, less current portion	9.5	'	12.6	'	'	'
Long-term solar energy system financing and capital lease obligations, less current portion, including consolidated variable interest entities of $364.9 and $69.2 in 2013 and 2012, respectively	2,071.20	'	1,498.60	'	'	'
Customer and other deposits	9.1	'	96.7	'	'	'
Deferred revenue for solar energy systems	71.6	'	100.2	'	'	'
Non-solar energy system deferred revenue	3.5	'	29.2	'	'	'
Long Term Intercompany Notes Receivable (Payable)	162.9	'	141.6	'	'	'
Other liabilities	289.3	'	200.4	'	'	'
Total liabilities	3,831.80	'	2,871.10	'	'	'
Redeemable Noncontrolling Interest, Equity, Carrying Amount	'	'	11.3	'	'	'
Redeemable noncontrolling interest	0	'	'	'	'	'
Total MEMC stockholders' equity	759.2	'	916.8	'	'	'
Noncontrolling interests	95.9	'	90.8	'	'	'
Total stockholders' equity	855.1	'	1,007.60	'	'	'
Total liabilities and stockholders' equity	4,686.90	'	3,890	'	'	'
Consolidating Adjustments [Member]	'	'	'	'	'	'
Assets, Current [Abstract]	'	'	'	'	'	'
Cash and cash equivalents	0	'	0	0	'	0
Restricted cash	0	'	0	'	'	'
Accounts receivable, net	0	'	0	'	'	'
Inventories	-28.9	'	-41.2	'	'	'
Solar energy systems held for development and sale	-53.9	'	-80.2	'	'	'
Prepaid and other current assets	0	'	0	'	'	'
Total current assets	-82.8	'	-121.4	'	'	'
Investments in subsidiaries	-179.5	'	-1,062.40	'	'	'
Non Solar Energy Systems Property Plant And Equipment	-48.9	'	-52.3	'	'	'
Solar energy systems, net	71.5	'	95.6	'	'	'
Restricted cash	0	'	0	'	'	'
Other assets	0	'	0	'	'	'
Total assets	-239.7	'	-1,140.50	'	'	'
Liabilities, Current [Abstract]	'	'	'	'	'	'
Current portion of long-term debt and short term borrowings	0	'	0	'	'	'
Short-term solar energy system financing and capital lease obligations, including consolidated variable interest entities of $31.7 and $2.9 in 2013 and 2012, respectively	0	'	0	'	'	'
Accounts payable	0	'	0	'	'	'
Accrued Liabilities, Current	0	'	0	'	'	'
Business Acquisition, Contingent Consideration, at Fair Value	0	'	'	'	'	'
Deferred revenue for solar energy systems	0	'	0	'	'	'
Contingent consideration related to acquisitions	'	'	0	'	'	'
Customer deposits	0	'	0	'	'	'
Intercompany receivable (payable) on ST Notes	0	'	0	'	'	'
Total current liabilities	0	'	0	'	'	'
Long-term debt and capital lease obligations, less current portion	0	'	0	'	'	'
Long-term solar energy system financing and capital lease obligations, less current portion, including consolidated variable interest entities of $364.9 and $69.2 in 2013 and 2012, respectively	0	'	0	'	'	'
Customer and other deposits	0	'	0	'	'	'
Deferred revenue for solar energy systems	0	'	0	'	'	'
Non-solar energy system deferred revenue	0	'	0	'	'	'
Long Term Intercompany Notes Receivable (Payable)	0	'	0	'	'	'
Other liabilities	0	'	0	'	'	'
Total liabilities	0	'	0	'	'	'
Redeemable Noncontrolling Interest, Equity, Carrying Amount	'	'	0	'	'	'
Redeemable noncontrolling interest	0	'	'	'	'	'
Total MEMC stockholders' equity	-239.7	'	-1,140.50	'	'	'
Noncontrolling interests	0	'	0	'	'	'
Total stockholders' equity	-239.7	'	-1,140.50	'	'	'
Total liabilities and stockholders' equity	-239.7	'	-1,140.50	'	'	'
Solar Energy [Member]	'	'	'	'	'	'
Liabilities, Current [Abstract]	'	'	'	'	'	'
Short-term solar energy system financing and capital lease obligations, including consolidated variable interest entities of $31.7 and $2.9 in 2013 and 2012, respectively	261.6	'	97.8	'	'	'
Long-term solar energy system financing and capital lease obligations, less current portion, including consolidated variable interest entities of $364.9 and $69.2 in 2013 and 2012, respectively	$2,080.90	'	$1,508.40	'	'	'

Condensed_Consolidating_Statem2

Condensed Consolidating Statement of Cash Flows (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:	'	'
Net cash (used in) provided by operating activities	($307.60)	($283.40)
Cash flows from investing activities:	'	'
Capital expenditures	-101.2	-100.3
Construction of solar energy systems	-261.3	-193.2
Purchases of cost and equity method investments	-46.6	-35.2
Net proceeds from equity method investments	68.4	3
Change in Restricted cash	-16.8	-1.3
Payments to Acquire Businesses, Net of Cash Acquired	-7.3	0
Proceeds from Other Deposits	0.6	4.8
Equity Infusions or investments in subsidiaries	0	0
Other	4.9	-0.1
Net cash used in investing activities	-359.3	-322.3
Cash flows from financing activities:	'	'
Cash paid for SunEdison acquisition contingent consideration	-0.8	-58
Proceeds from solar energy system financing and capital lease obligations	626.4	720.3
Repayments of solar energy system financing and capital lease obligations	-64.4	-184
Net repayments of customer deposits related to long-term supply agreements	-51.7	-23.6
Principal payments on long-term debt	-1.4	-1.8
Common stock repurchased	239.6	-0.1
Dividends to noncontrolling interest	25.9	16.4
(Repayment of) collection of intercompany debt	0	0
Second lien term loan	0	196
Debt financing fees	-25.6	-35.2
Proceeds from (Payments for) Other Financing Activities	-1.4	0
Net cash provided by financing activities	746.6	630
Effect of exchange rate changes on cash and cash equivalents	-12	-0.3
Net increase in cash and cash equivalents	67.7	24
Cash and cash equivalents at beginning of period	572.6	585.8
Cash and cash equivalents at end of period	640.3	609.8
MEMC, Inc. [Member]	'	'
Cash flows from operating activities:	'	'
Net cash (used in) provided by operating activities	-48.6	-100.2
Cash flows from investing activities:	'	'
Capital expenditures	-11.4	-14.7
Construction of solar energy systems	0	0
Purchases of cost and equity method investments	0	-3.8
Net proceeds from equity method investments	68.5	7.2
Change in Restricted cash	0	0
Payments to Acquire Businesses, Net of Cash Acquired	0	'
Proceeds from Other Deposits	0	0
Equity Infusions or investments in subsidiaries	-66.8	-44
Other	0.7	1.9
Net cash used in investing activities	-9	-53.4
Cash flows from financing activities:	'	'
Cash paid for SunEdison acquisition contingent consideration	0	0
Proceeds from solar energy system financing and capital lease obligations	0	0
Repayments of solar energy system financing and capital lease obligations	0	0
Net repayments of customer deposits related to long-term supply agreements	0	0
Principal payments on long-term debt	0	0
Common stock repurchased	239.6	-0.1
Dividends to noncontrolling interest	0	0
(Repayment of) collection of intercompany debt	-115	-33.8
Second lien term loan	'	196
Debt financing fees	0	-12.7
Proceeds from (Payments for) Other Financing Activities	-0.6	'
Net cash provided by financing activities	124	149.4
Effect of exchange rate changes on cash and cash equivalents	0	-0.2
Net increase in cash and cash equivalents	66.4	-4.4
Cash and cash equivalents at beginning of period	65.1	228.9
Cash and cash equivalents at end of period	131.5	224.5
Guarantor Subsidiaries [Member]	'	'
Cash flows from operating activities:	'	'
Net cash (used in) provided by operating activities	5.5	28.9
Cash flows from investing activities:	'	'
Capital expenditures	-8.2	-16.3
Construction of solar energy systems	0	0
Purchases of cost and equity method investments	-1.5	0
Net proceeds from equity method investments	0	0
Change in Restricted cash	-0.5	-2.1
Payments to Acquire Businesses, Net of Cash Acquired	0	'
Proceeds from Other Deposits	0	0
Equity Infusions or investments in subsidiaries	-24.2	-6.7
Other	-1.3	0
Net cash used in investing activities	-35.7	-25.1
Cash flows from financing activities:	'	'
Cash paid for SunEdison acquisition contingent consideration	-0.8	-3.8
Proceeds from solar energy system financing and capital lease obligations	0	8.4
Repayments of solar energy system financing and capital lease obligations	-0.1	-0.5
Net repayments of customer deposits related to long-term supply agreements	0	0
Principal payments on long-term debt	0	0
Common stock repurchased	0	0
Dividends to noncontrolling interest	0	0
(Repayment of) collection of intercompany debt	70.4	9.5
Second lien term loan	'	0
Debt financing fees	0	0
Proceeds from (Payments for) Other Financing Activities	0	'
Net cash provided by financing activities	69.5	13.6
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase in cash and cash equivalents	39.3	17.4
Cash and cash equivalents at beginning of period	60	58.3
Cash and cash equivalents at end of period	99.3	75.7
Non-Guarantor Subsidiaries [Member]	'	'
Cash flows from operating activities:	'	'
Net cash (used in) provided by operating activities	-431.7	-152.5
Cash flows from investing activities:	'	'
Capital expenditures	-81.6	-69.3
Construction of solar energy systems	-97.1	-243.3
Purchases of cost and equity method investments	-45.1	-31.4
Net proceeds from equity method investments	-0.1	-4.2
Change in Restricted cash	-16.3	0.8
Payments to Acquire Businesses, Net of Cash Acquired	-7.3	'
Proceeds from Other Deposits	0.6	4.8
Equity Infusions or investments in subsidiaries	91	50.7
Other	8.5	-11.5
Net cash used in investing activities	-147.4	-303.4
Cash flows from financing activities:	'	'
Cash paid for SunEdison acquisition contingent consideration	0	-54.2
Proceeds from solar energy system financing and capital lease obligations	626.4	711.9
Repayments of solar energy system financing and capital lease obligations	-64.3	-183.5
Net repayments of customer deposits related to long-term supply agreements	-51.7	-23.6
Principal payments on long-term debt	-1.4	-1.8
Common stock repurchased	0	0
Dividends to noncontrolling interest	25.9	16.4
(Repayment of) collection of intercompany debt	44.6	24.3
Second lien term loan	'	0
Debt financing fees	-25.6	-22.5
Proceeds from (Payments for) Other Financing Activities	-0.8	'
Net cash provided by financing activities	553.1	467
Effect of exchange rate changes on cash and cash equivalents	-12	-0.1
Net increase in cash and cash equivalents	-38	11
Cash and cash equivalents at beginning of period	447.5	298.6
Cash and cash equivalents at end of period	409.5	309.6
Consolidating Adjustments [Member]	'	'
Cash flows from operating activities:	'	'
Net cash (used in) provided by operating activities	167.2	-59.6
Cash flows from investing activities:	'	'
Capital expenditures	0	0
Construction of solar energy systems	-164.2	50.1
Purchases of cost and equity method investments	0	0
Net proceeds from equity method investments	0	0
Change in Restricted cash	0	0
Payments to Acquire Businesses, Net of Cash Acquired	0	'
Proceeds from Other Deposits	0	0
Equity Infusions or investments in subsidiaries	0	0
Other	-3	9.5
Net cash used in investing activities	-167.2	59.6
Cash flows from financing activities:	'	'
Cash paid for SunEdison acquisition contingent consideration	0	0
Proceeds from solar energy system financing and capital lease obligations	0	0
Repayments of solar energy system financing and capital lease obligations	0	0
Net repayments of customer deposits related to long-term supply agreements	0	0
Principal payments on long-term debt	0	0
Common stock repurchased	0	0
Dividends to noncontrolling interest	0	0
(Repayment of) collection of intercompany debt	0	0
Second lien term loan	'	0
Debt financing fees	0	0
Proceeds from (Payments for) Other Financing Activities	0	'
Net cash provided by financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$0	$0

Condensed_Consolidating_Financ3

Condensed Consolidating Financial Information (Narrative) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 10, 2011
In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Senior Notes [Member]
Debt Instrument [Line Items]	'	'	'
Senior notes, issued amount	$3,118.30	$2,368.30	$550
Debt Instrument, Interest Rate, Stated Percentage	'	'	7.75%