Acquisition of Projects

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- Definition

Capacity of Power Plant

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- Definition

Number of shares of equity interests issued or issuable to acquire entity.

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-Publisher FASB
-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment in the future.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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Acquisitions - 2017 and 2016 Acquisitions and Dropdowns Narrative (Details) ZAR in Millions, $ in Millions		6 Months Ended
	Apr. 08, 2016 USD ($) MW	Dec. 31, 2017 USD ($)	Dec. 31, 2017 ZAR	Jun. 30, 2017 USD ($) MW shares	Jun. 30, 2017 ZAR shares	Dec. 31, 2016 USD ($)	Feb. 24, 2016 power_plant	Dec. 31, 2015 MW	Aug. 31, 2015 USD ($) power_plant	Apr. 30, 2015 power_plant MW
BioTherm
Business Acquisition [Line Items]
Number of projects acquired \| power_plant									3	3
Payments to acquire businesses				$ 9.7
Amount held in escrow pending lender release letter				41.2					$ 65.6
BioTherm \| Minority interests in South African acquisition
Business Acquisition [Line Items]
Payments to acquire businesses				$ 6.8	ZAR 88.9
NPS Star and WXA
Business Acquisition [Line Items]
Capacity of acquired power plants \| MW				35.6
Percentage of voting interests acquired							49.00%
NPS Star
Business Acquisition [Line Items]
Number of projects acquired \| power_plant							3
Capacity of acquired power plants \| MW								17.8
WXA
Business Acquisition [Line Items]
Number of projects acquired \| power_plant							3
Capacity of acquired power plants \| MW								17.8
Alto Cielo
Business Acquisition [Line Items]
Capacity of acquired power plants \| MW	26.4
Payments to acquire businesses	$ 32.3
Percentage of voting interests acquired	100.00%
Escrow deposits related to property sale				$ 1.1
South Africa \| BioTherm
Business Acquisition [Line Items]
Number of projects acquired \| power_plant									3	3
Capacity of acquired power plants \| MW										32.6
Scenario, forecast \| BioTherm
Business Acquisition [Line Items]
Payments to acquire businesses		$ 75.3
USD \| BioTherm \| BioTherm
Business Acquisition [Line Items]
Payments to acquire businesses				2.0
USD \| Scenario, forecast \| BioTherm
Business Acquisition [Line Items]
Payments to acquire businesses		67.6
ZAR \| BioTherm \| BioTherm
Business Acquisition [Line Items]
Payments to acquire businesses				$ 0.9	ZAR 11.6
ZAR \| Scenario, forecast \| BioTherm
Business Acquisition [Line Items]
Payments to acquire businesses		$ 7.7	ZAR 100.4
Deposits for acquisitions \| Common Stock \| BioTherm
Business Acquisition [Line Items]
Common stock issued in acquisition (in shares) \| shares				544,055	544,055
Non-current restricted cash \| BioTherm
Business Acquisition [Line Items]
Cash deposits held for acquisitions				$ 15.1		$ 16.4			$ 20.3