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Other Balance Sheet Items Other Balance Sheet Items (Other long-term assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]    
Restricted Cash $ 5.3 $ 5.3
Operating Lease, Right-of-Use Asset 8.7 8.4
Prepaid Expense, Noncurrent 7.5 11.0
Prepaid registry fees, noncurent 8.3 8.7
Other Assets, Miscellaneous, Noncurrent 2.3 2.3
Other Assets, Noncurrent $ 32.1 $ 35.7