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Deferred Revenue - Composition of Deferred Revenue (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]    
Current deferred revenue $ 1,711.3 $ 1,544.4
Noncurrent deferred revenue 725.1 654.4
Domains    
Disaggregation of Revenue [Line Items]    
Current deferred revenue 810.7 752.7
Noncurrent deferred revenue 410.4 382.2
Hosting and presence    
Disaggregation of Revenue [Line Items]    
Current deferred revenue 574.8 526.7
Noncurrent deferred revenue 218.1 187.2
Business applications    
Disaggregation of Revenue [Line Items]    
Current deferred revenue 325.8 265.0
Noncurrent deferred revenue $ 96.6 $ 85.0