The Company and Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Federal [Member]	Mar. 31, 2012 California [Member]	Mar. 31, 2012 Other Jurisdictions [Member]
Accounting Policies [Abstract]
Cash	$ 85.2	$ 121.2
Cash equivalents	58.7	58.7
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards			41.1	55.1	20.3
Net operating loss carryforwards associated with windfall tax benefits			$ 39.5	$ 29.9	$ 20.3
Number of other jurisdictions in which Company is subject to tax	15
Operating loss carryforwards, expiration date			2028	2013	2022