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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
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