Income Tax Valuation Allowance (Details6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets	$ 34.4	$ 33.9
Federal [Member]
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets	2.3
State net operating loss carryforwards [Member]
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets	20.9
State tax credits [Member]
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets	10.0
State temporary differences [Member]
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets	1.2
State [Member]
Valuation Allowance [Line Items]
Operating loss carryforward period	20 years
Maximum tax benefit available per year amount	$ 5
Maximum tax benefit available per year percent of income	30.00%