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Other Balance Sheet Items (Other Current Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]    
Prepaid registry fees, current $ 24.7 $ 24.2
Prepaid expenses 25.6 24.8
Accounts Receivable, Net 5.2 5.3
Income Taxes Receivable, Current 1.5 7.7
Other Assets, Miscellaneous, Current 1.1 0.9
Other Assets, Current $ 58.1 $ 62.9