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Fair Value Of Financial Instruments (Narrative) (Details)
6 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2024
₨ / shares
Sep. 30, 2024
USD ($)
Derivatives, Fair Value [Line Items]          
Transfers into or out of Level 3 $ 0 $ 0      
Accreted interest 3,735,000        
Change in fair value 0 $ 0      
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 6.60%        
Cell C [Member] | Marketability Discount [Member]          
Derivatives, Fair Value [Line Items]          
Investment fair value measurement inputs 20.00%   20.00%    
Cell C [Member] | Minority Discount [Member]          
Derivatives, Fair Value [Line Items]          
Investment fair value measurement inputs 24.00%   24.00%    
Cell C [Member] | Minimum [Member] | Minority Discount [Member]          
Derivatives, Fair Value [Line Items]          
Increase decrease in weighted average cost of capital 1.00%        
Cell C [Member] | Maximum [Member] | Minority Discount [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%        
Cell C [Member] | Class A [Member] | Minority Discount [Member]          
Derivatives, Fair Value [Line Items]          
Investment fair value measurement inputs 24.00%        
Mobikwik [Member]          
Derivatives, Fair Value [Line Items]          
Investment shares owned | shares 6,215,620        
Investment amount owned $ 42,600,000       $ 76,300,000
Last traded price of share | (per share) $ 6.85     ₨ 586.15