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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Oct. 29, 2019
Sep. 01, 2019
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Asset acquisition, consideration transferred   $ 15.9      
Goodwill     $ 1,969.8 $ 1,979.4 $ 1,973.6
Stop, Breathe & Think          
Business Acquisition [Line Items]          
Asset acquisition, consideration transferred $ 7.2        
Fair value of total consideration transferred 13.3        
Cash 9.2        
Contingent consideration $ 4.1        
Minimum estimated future payments, contingent consideration     0.0    
Maximum estimated future payments, contingent consideration     6.0    
Goodwill     $ 7.1    
Publisher relationships          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life   9 years      
Customer lists          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life     3 years    
Minimum | Other          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life     4 years    
Maximum | Other          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life     5 years