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Other Balance Sheet Items Other balance Sheet items (Other long-term assets) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Balance Sheet Related Disclosures [Abstract] |  |
Prepaid registry fees, noncurent | $ 8.3 | $ 9.1
Operating Lease, Right-of-Use Asset | 7.4 | 7.2
Prepaid Expense, Noncurrent | 5.4 | 5.4
Restricted Cash | 4.8 | 6.6
Other Assets, Miscellaneous, Noncurrent | 3.1 | 2.3
Total other long-term assets | $ 29.0 | $ 30.6

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