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Acquisitions and Dispositions (Narrative) (Details)
$ in Millions
 12 Months Ended
Jul. 15, 2021
USD ($)
title
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Asset Acquisition [Line Items]      
Cash consideration   $ 123.6 $ 0.0
Spyglass Library      
Asset Acquisition [Line Items]      
Number of titles acquired | title 200    
Spyglass      
Asset Acquisition [Line Items]      
Equity method investment, ownership percentage 18.90%    
Spyglass | Spyglass Library      
Asset Acquisition [Line Items]      
Purchase price of asset acquisition and preferred equity interest $ 191.4    
Cash paid at closing for assets acquisition and preferred equity interest 171.4    
Asset acquisition and preferred equity interest, deferred purchase consideration payable $ 20.0    
Asset acquisition and preferred equity interest, period to pay deferred purchase consideration payable 2 years    
Disposal Group, Not Discontinued Operations | Pantaya      
Asset Acquisition [Line Items]      
Equity interest sold   75.00%  
Cash consideration   $ 123.6  
Gain, before income taxes, on sale of Pantaya   44.1  
Goodwill allocated related to sale of Pantaya   $ 69.0