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Goodwill and Other Intangible Assets - Goodwill Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]                
Goodwill         $ 24.1 $ 24.1 $ 24.1 $ 23.8
Intangible Assets, Net (Excluding Goodwill)         29.2 31.3 36.4 38.7
Goodwill and other intangible assets $ 59.3 $ 58.0 $ 59.3 $ 58.0 53.3 55.4 60.5 62.5
Other Intangible Assets, Net 9.0   9.0          
Disposal Group, Including Discontinued Operation, Intangible Assets   0.5   0.5 $ 0.0 0.4 0.6 0.8
Goodwill, Acquired During Period       0.3        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     9.0 2.8        
Finite-lived Intangible Assets Acquired     3.9          
Amortization of Intangible Assets (3.0) (2.6) (9.4) (7.9)        
WTM entities except Buzzmove [Member]                
Acquired Finite-Lived Intangible Assets [Line Items]                
Goodwill 24.1 24.1 24.1 24.1        
Intangible Assets, Net (Excluding Goodwill) 26.2 33.9 26.2 33.9        
Goodwill and other intangible assets 50.3 58.0 50.3 58.0        
Intangible Asset and Goodwill [Member]                
Acquired Finite-Lived Intangible Assets [Line Items]                
Disposal Group, Including Discontinued Operation, Intangible Assets   0.5   0.5   $ 0.4 $ 0.6 $ 0.8
Acquisition of goodwill and intangible assets       3.1        
Finite-lived Intangible Assets Acquired     3.9          
Amortization of Intangible Assets $ (3.0) $ (2.6) $ (9.4) $ (7.9)