Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure
Effective income tax rate	37.80%		42.70%
Tax expense adjustment due to impairment		$ 19.9
Deferred tax asset valuation allowance | State
Valuation Allowance
Increase (decrease) in valuation allowance		40.8
Deferred tax asset valuation allowance | Federal
Valuation Allowance
Increase (decrease) in valuation allowance		$ (10.8)