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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2022
Derivatives, Fair Value [Line Items] |  |  |  |
Transfers into or out of Level 3 |  | $ 0 | $ 0 |
Movement in carrying value of assets measured on a recurring basis |  | 0 | 0 |
(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 |  | 30.00% |  | 15.00%
Cell C [Member] | Shareholding Percentage [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Investment fair value measurement inputs |  | 5.00% |  | 15.00%
Cell C [Member] | Class A [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Investment shares owned |  | 75,000,000 |  |

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- Definition Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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