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Commitments and Contingent Liabilities - Lease Commitments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Leased Assets [Line Items]      
Loss Contingency, Receivable $ 6.0    
Rent expense net of sublease rental income 14.9 $ 11.0 $ 11.3
Future operating lease payments 82.3    
Capital Leases [Abstract]      
2015 3.1    
2016 2.5    
2017 2.5    
2018 2.5    
2019 2.5    
Thereafter 10.0    
Total 23.1    
Operating Lease Future Minimum Payments [Abstract]      
2015 12.8    
2016 11.2    
2017 10.7    
2018 9.6    
2019 7.1    
2020 and thereafter 30.9    
Total 82.3    
Audience, Inc.      
Operating Leased Assets [Line Items]      
Loss Contingency, Accrual, Current $ 0.5