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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, 2022
USD ($)
Item
shares
Jun. 30, 2021
USD ($)
shares
Derivatives, Fair Value [Line Items]        
Outstanding foreign exchange contracts | Item     0  
Transfers into or out of Level 3     $ 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] | Minimum [Member]        
Derivatives, Fair Value [Line Items]        
Increase decrease in weighted average cost of capital     (3.20%)  
Cell C [Member] | Maximum [Member]        
Derivatives, Fair Value [Line Items]        
Increase decrease in weighted average cost of capital     1.90%  
Cell C [Member] | Class A [Member]        
Derivatives, Fair Value [Line Items]        
Investment shares owned | shares     75,000,000 75,000,000