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Fair Value Measurements (Schedule of Carrying Value and Estimated Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Jun. 30, 2020
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Broadcast rights payable $ 10.8 $ 12.7
Long-term debt 2,746.0 2,985.9
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Broadcast rights payable 9.8 11.7
Long-term debt $ 2,859.3 $ 2,753.6