DESCRIPTION OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenues and Notes Payable (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Apr. 30, 2014
Revenue recognition
Revenue from product sales	$ 0.0
Allowance for doubtful accounts	0.0
Income Taxes
Unrecognized tax benefits would affect our effective income tax rate if recognized	$ 0.0
Non-Recourse Notes Payable due 2029 \| Private Placement
Amortization of Debt Issuance Costs from Non-recourse Notes Payable, due 2029
Non-Recourse Debt		$ 450.0
Interest rate (as a percent)	9.00%	9.00%
Transaction costs		$ 15.3

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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-Publisher FASB
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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of debt for which creditor does not have general recourse to the debtor but rather has recourse only to the property used for collateral in the transaction or other specific property.

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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