Income Taxes Net Operating Loss Carryforwards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Jan. 01, 2019
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards Expiring In 2016	$ 0.7
California Franchise Tax Board [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards Expiring In 2016	39.6
Net Operating Loss Carryforwards Expiring In 2017	14.1
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 675.1
Operating Loss Carryforwards, Expiration Dates	Jan. 01, 2019
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 18.5
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 424.3
Operating Loss Carryforwards, Expiration Dates	Jan. 01, 2016
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 20.5
California Franchise Tax Board [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards Expiring In Year Thirteen and Thereafter	$ 321.8