Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Income Tax Contingency [Line Items]
Effective tax rate	(134.40%)	42.00%
Expected effective tax rate	39.00%
Percentage points lower or higher than normalized effective tax rate	173.00%	3.00%
Accrued interest and penalties	$ 1.1
Anticipated decrease in unrecognized tax benefits	$ 0.8
Periods subsequent	2007
Maximum [Member]
Income Tax Contingency [Line Items]
State of California and other state jurisdictions years	2009
Minimum [Member]
Income Tax Contingency [Line Items]
State of California and other state jurisdictions years	2007

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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