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Goodwill and Other Intangible Assets - Changes In Intangible Assets and Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 04, 2016
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]                
Payments to acquire businesses and interest in affiliates     $ 0.0 $ 13.7        
Assets     3,637.1     $ 6,520.2    
Goodwill     25.9 $ 25.9 $ 25.9 25.9 $ 18.3 $ 18.6
Liabilities     $ 299.9     $ 2,804.2    
Oversee.net                
Acquired Finite-Lived Intangible Assets [Line Items]                
Payments to acquire businesses and interest in affiliates   $ 3.9            
Buzzmove                
Acquired Finite-Lived Intangible Assets [Line Items]                
Ownership interest (as a percent) 70.90%   77.10%          
Assets $ 11.5              
Goodwill 7.6              
Intangible Assets, Net (Excluding Goodwill) 1.1              
Liabilities 0.1              
United Kingdom, Pounds | Buzzmove                
Acquired Finite-Lived Intangible Assets [Line Items]                
Acquisition of subsidiary 6.1              
United States of America, Dollars | Buzzmove                
Acquired Finite-Lived Intangible Assets [Line Items]                
Acquisition of subsidiary $ 8.1