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Acquisitions and Strategic Investments (Narrative) (Details) - USD ($)
$ in Millions
Mar. 14, 2018
Feb. 21, 2018
Dec. 31, 2018
Mar. 13, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Goodwill     $ 54.6   $ 0.0
Ivie and Associates          
Business Acquisition [Line Items]          
Cash paid for acquisitions   $ 90.0      
Potential earn-out   16.0      
Preliminary purchase price   105.4      
Acquired cash   13.6      
Estimated future cash payments   15.4      
Identifiable finite-lived intangibles acquired   79.6      
Goodwill   28.3      
Goodwill, tax deductible   $ 26.4      
Ivie and Associates | Minimum          
Business Acquisition [Line Items]          
Estimated finite-lived intangible assets, useful life (in years)   3 years      
Ivie and Associates | Maximum          
Business Acquisition [Line Items]          
Estimated finite-lived intangible assets, useful life (in years)   8 years      
Rise Interactive          
Business Acquisition [Line Items]          
Cash paid for acquisitions $ 8.7        
Preliminary purchase price 48.5        
Acquired cash $ 13.7        
Noncontrolling interest, ownership percentage by noncontrolling owners 43.00%        
Identifiable finite-lived intangibles acquired $ 23.1        
Goodwill $ 26.3        
Parent ownership percentage 57.00%     19.00%  
Conversion of loans to equity ownership $ 9.3        
Rise Interactive | Minimum          
Business Acquisition [Line Items]          
Estimated finite-lived intangible assets, useful life (in years) 5 years        
Rise Interactive | Maximum          
Business Acquisition [Line Items]          
Estimated finite-lived intangible assets, useful life (in years) 6 years