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Basis of Presentation and Summary of Significant Accounting Policies - Revenue Recognition (Details)
Jun. 30, 2021
Magazine and Digital Subscriptions | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 5 years