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Investments (Narrative) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Investments [Abstract] |  |  |
Equity method investments | $ 80,500,000 |  | $ 79,600,000
Investments in marketable equity securities | 0 |  | 0
Gain (loss) on marketable equity securities | 0 |  |
Unrealized gain (loss) on marketable equity securities |  | $ 4,300,000 |
Investments in non-marketable equity securities | 41,500,000 |  | $ 42,700,000
Impairment charge on non-marketable equity security | $ 1,200,000 |  |

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