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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 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]        
Property and equipment, useful life 5 years     4 years
Net income attributable to common stockholders $ 132.3 $ 69.0    
Basic net income per share (in dollars per share) $ 0.40 $ 0.20    
Diluted net income per share (in dollars per share) $ 0.39 $ 0.20    
Cost of revenue [1] $ (105.8) $ (116.8)    
Service Life        
Property, Plant and Equipment [Line Items]        
Reduction in depreciation expense 10.4      
Net income attributable to common stockholders $ 8.1      
Basic net income per share (in dollars per share) $ 0.03      
Diluted net income per share (in dollars per share) $ 0.03      
Service Life | Forecast        
Property, Plant and Equipment [Line Items]        
Cost of revenue     $ 30.5  
[1] Includes stock-based compensation as follows:
Three Months Ended
March 31,
20242023
Cost of revenue$5.2 $5.4 
Research and development(2)
55.4 52.9 
Sales and marketing5.1 5.5 
General and administrative12.3 12.2 
Total stock-based compensation$78.0 $76.0