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Fair Value Measurements (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Impairment charges $ 87.9 $ 0.0 $ 405.3 $ 50.3
National Media | Operating Lease Asset        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Impairment charges $ 64.5      
Discount Rate        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Intangible assets measurement input   0.11    
Discount Rate | Weighted Average | Level 3 | Recurring fair value measurements        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Contingent consideration measurement input   0.035    
Royalty Rate        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Intangible assets measurement input   0.0161    
Terminal Revenue Growth Rate        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Intangible assets measurement input   0.0148