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Fair Value Of Financial Instruments (Narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2023
USD ($)
Item
shares
Jun. 30, 2022
USD ($)
Item
Jun. 30, 2021
USD ($)
Derivatives, Fair Value [Line Items]          
Outstanding foreign exchange contracts | Item     0 0  
Transfers into or out of Level 3     $ 0 $ 0 $ 0
Foreign currency transaction realized gain     3,700,000    
Net gain related to fair value adjustment to currency options     6,100,000    
(Gain) Loss related to fair value adjustment to currency options $ 2,400,000 $ 2,400,000      
Nonrecurring [Member]          
Derivatives, Fair Value [Line Items]          
Liabilities measured at fair value     0    
Cell C [Member]          
Derivatives, Fair Value [Line Items]          
Investment amount owned     $ 0.0 $ 0.0  
Equity method investment, percentage of ownership interest     0.00%    
Cell C [Member] | Marketability Discount [Member]          
Derivatives, Fair Value [Line Items]          
Investment fair value measurement inputs     20.00% 10.00%  
Cell C [Member] | Minority Discount [Member]          
Derivatives, Fair Value [Line Items]          
Investment fair value measurement inputs     24.00% 15.00%  
Cell C [Member] | Minimum [Member]          
Derivatives, Fair Value [Line Items]          
Increase decrease in weighted average cost of capital     (1.00%)    
Cell C [Member] | Maximum [Member]          
Derivatives, Fair Value [Line Items]          
Increase decrease in weighted average cost of capital     1.00%    
Cell C [Member] | Class A [Member]          
Derivatives, Fair Value [Line Items]          
Investment shares owned | shares     75,000,000    
Cell C [Member] | Class A [Member] | Marketability Discount [Member]          
Derivatives, Fair Value [Line Items]          
Investment fair value measurement inputs     20.00% 10.00%  
Cell C [Member] | Class A [Member] | Minority Discount [Member]          
Derivatives, Fair Value [Line Items]          
Investment fair value measurement inputs     24.00% 15.00%  
Cell C [Member] | Class A [Member] | Shareholding Percentage [Member]          
Derivatives, Fair Value [Line Items]          
Investment fair value measurement inputs     5.00% 15.00%