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Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cost method investments $ 14.2 $ 21.5  
Available-for-sale securities 4.3 4.8  
Net foreign currency transaction gains (losses) $ 12.7 $ 4.7 $ 8.7
Percentage of revenue from largest client 3.00%    
Minimum [Member]      
Identifiable intangible assets, useful life 5 years    
Maximum [Member]      
Identifiable intangible assets, useful life 12 years    
Furniture [Member] | Minimum [Member]      
Property and Equipment, useful life 7 years    
Furniture [Member] | Maximum [Member]      
Property and Equipment, useful life 10 years    
Equipment [Member] | Minimum [Member]      
Property and Equipment, useful life 3 years    
Equipment [Member] | Maximum [Member]      
Property and Equipment, useful life 5 years