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Income Tax Provision (Benefit) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Jun. 30, 2013	Sep. 30, 2013
Operating Loss Carryforwards [Line Items]
Number of years cumulative income or loss is evaluated	3 years
Income tax benefit related to decrease in valuation allowance of deferred tax assets		$ 36.3
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance		$ 8.5

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.