Debt Balance Sheet and Income Statement Summary (Details) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 08, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Aug. 01, 2014
Debt Instrument [Line Items]
Commitment fee amount, less than					$ 0.1	$ 0.1
Letters of credit issued and outstanding			$ 20.7		20.7
Deferred financing costs			0.5		0.5		$ 0.3
Amortization of deferred financing costs			0.2	$ 0.4	0.3	0.6
Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Capitalized deferred financing costs		$ 0.8
Debt issuance expense		$ 0.1
Working Capital Facility
Debt Instrument [Line Items]
Interest expense			0.4	0.6	0.7	1.2
Commitment fee amount, less than			0.1	0.1
Letters of credit issued and outstanding								$ 15.0
Fees on letters of credit issued and outstanding			0.1	$ 0.1	0.2	$ 0.3
Other Current Assets
Debt Instrument [Line Items]
Deferred financing costs			0.5		0.5		0.2
Other Noncurrent Assets
Debt Instrument [Line Items]
Deferred financing costs							$ 0.1
Convertible Debt
Debt Instrument [Line Items]
Interest expense debt			0.1		0.1
Convertible Debt | Oasis Power Holdings Convertible Debt
Debt Instrument [Line Items]
Beneficial conversion feature	$ 0.8
Amortization of debt discount (less than $1.0)			$ 0.1		$ 0.1
Convertible Subordinated Debt | Oasis Power Holdings Convertible Debt
Debt Instrument [Line Items]
Beneficial conversion feature	$ 0.8