Historic Tax Credits (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	37 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Phase I Counterparty [Member]
Counterparty [Line Items]
Priority Return Expense	$ 1.2		$ 1.0
Tax Credit Amortization Income	1.8
Interest and Other Income	0.6
Phase II Counterparty [Member]
Counterparty [Line Items]
Priority Return Expense	0.3		0.1
Interest and Other Income	1.9
Equity Contribution	5.8	5.5
Phase II(i) Counterparty [Member]
Counterparty [Line Items]
Tax Credit Amortization Income	1.2
Phase II(ii) Counterparty [Member]
Counterparty [Line Items]
Tax Credit Amortization Income	$ 1.0