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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 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2024
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 $ 106.7 $ 114.1 $ 349.5 $ 226.3        
Basic net income per share (in dollars per share) $ 0.34 $ 0.34 $ 1.08 $ 0.66        
Diluted net income per share (in dollars per share) $ 0.34 $ 0.33 $ 1.07 $ 0.65        
Favorable impact on cost of revenue [1],[2] $ (111.5) $ (119.6) $ (324.3) $ (356.5)        
Service Life                
Property, Plant and Equipment [Line Items]                
Reduction in depreciation expense 6.9   26.3          
Net income attributable to common stockholders $ 5.2   $ 20.4          
Basic net income per share (in dollars per share) $ 0.02   $ 0.06          
Diluted net income per share (in dollars per share) $ 0.02   $ 0.06          
Service Life | Forecast                
Property, Plant and Equipment [Line Items]                
Favorable impact on cost of revenue         $ 30.5      
[1] Includes expenses related to the Company's 2023 reduction in workforce such as severance, benefits and other related items during the three and nine months ended September 30, 2023.
[2] Includes stock-based compensation as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2024202320242023
Cost of revenue$5.8 $5.8 $17.0 $17.6 
Research and development(4)
66.7 58.6 186.3 178.9 
Sales and marketing6.1 5.2 17.4 17.0 
General and administrative13.7 14.2 40.1 41.6 
Total stock-based compensation$92.3 $83.8 $260.8 $255.1