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Commitments and Contingencies (Lease Obligations) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Capital Leased Assets [Line Items]        
Extended lease term 3 years      
Capital leases increase in future minimum payments due $ 13.7      
Rent expense   $ 34.7 $ 26.6 $ 27.9
Land, Buildings and Improvements [Member] | Los Gatos Buildings [Member]        
Capital Leased Assets [Line Items]        
Total costs of buildings and improvements   40.7    
Capital lease obligations   29.0    
Capital leases, future minimum payments due   21.1    
Capital lease financing obligation under extended lease term   21.8    
Land, Buildings and Improvements [Member] | Los Gatos Buildings Expanded Site and Los Angeles [Member]        
Capital Leased Assets [Line Items]        
Capital leases, future minimum payments due   $ 428.7