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Description of the Business and Summary of Significant Accounting Policies - Use of estimates (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Jan. 01, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]              
Property and equipment, useful life         5 years 5 years 4 years
Net income attributable to common stockholders $ 110.5 $ 43.2 $ 242.8 $ 112.2      
Basic net income per share (in dollars per share) $ 0.34 $ 0.13 $ 0.74 $ 0.33      
Diluted net income per share (in dollars per share) $ 0.34 $ 0.13 $ 0.73 $ 0.32      
Favorable impact on cost of revenue [1],[2] $ (107.0) $ (120.1) $ (212.8) $ (236.9)      
Service Life              
Property, Plant and Equipment [Line Items]              
Reduction in depreciation expense 9.0   19.4        
Net income attributable to common stockholders $ 7.1   $ 15.2        
Basic net income per share (in dollars per share) $ 0.02   $ 0.05        
Diluted net income per share (in dollars per share) $ 0.02   $ 0.05        
Favorable impact on cost of revenue     $ 30.5        
[1] Includes expenses related to the Company's reduction in workforce such as severance, benefits and other related items during the three and six months ended June 30, 2023.
[2] Includes stock-based compensation as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
2024202320242023
Cost of revenue$6.0 $6.4 $11.2 $11.8 
Research and development(4)
64.2 67.4 119.6 120.3 
Sales and marketing6.2 6.3 11.3 11.8 
General and administrative14.1 15.2 26.4 27.4 
Total stock-based compensation$90.5 $95.3 $168.5 $171.3