Historic Tax Credits (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Oct. 21, 2015
Phase II(i) Counterparty [Member]
Counterparty [Line Items]
Tax Credit Amortization Income		$ 0.9	$ 1.2
Phase II(ii) Counterparty [Member]
Counterparty [Line Items]
Tax Credit Amortization Income		0.9	1.0
Phase II Counterparty [Member]
Counterparty [Line Items]
Tax Credit Amortization Income		$ 1.8	1.9
Priority Return Expense	$ 0.3		$ 0.3
Subsequent Event [Member] | Phase I Counterparty [Member]
Counterparty [Line Items]
Payment to repurchase ownership interest				$ 1.8