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Other Balance Sheet Items (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract] |  |
Reston Building Purchase Price | $ 19.8 |
Reston Building Purchase Price Allocation - Buildings | 13.0 |
Reston Building Purchase Price Allocation - Land | 6.8 |
Deposits Assets, Noncurrent | 145.0 | $ 145.0
Amortization of Other Deferred Charges | $ 39.5 |

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